"All of the above" is the correct answer.

Holding eye contact with a girl while saying nothing will create a moment of awkwardness, and the girl will speak to break the tension.

You can also turn your head away as if she's losing your attention, and she'll talk to re-engage you.

Looking her up and down and making an unexplained facial expression (like surprise or disgust) will make her curious what it is you see about her.

All of these are great ways to pull a girl into a conversation and get her to contribute more.

Stepping in, getting close to the girl's face and holding sustained eye contact is the best way to create INTENSE sexual tension.

If you were to step back from her, the sexual tension would be far less.

Talking about extremely sexual topics can actually BREAK the sexual tension in many cases.

Looking her up and down while you talk to her can create sexual tension, but it can also BREAK tension if the girl gets offended or feels uncomfortable with it.  It's not a reliable as simply holding eye contact with her.

The correct answer is "more attractive" - women with larger pupils are judged as more attractive by men.

The correct answer is your eyes are THE MOST important nonverbal message givers.

Your eyes are absolutely critical for holding a woman's engagement and for creating sexual tension.  A lot of attraction is done through the eyes.

Your mouth (your smile) would be second place.

And your overall facial expressiveness is very important.

The correct answer is to focus in on her eyes to most safely create sexual tension.

Looking at the girls entire face is not as connective or as intimate as looking her in the eye.

Looking her body up and down can also create sexual tension, but it's more risky than looking her in the eyes.

And looking at her breasts is even more risky- it's very easy for her to object or call you out on it.

The correct answer here is to hold eye contact with her, smile, and then go up to her and say hello.

If you immediately look away, you come across as insecure, submissive, and unworthy of her.

Trying to create sexual tension by imagining having sex with her can backfire on you because it's too early for that still.

As for triangular gazing, you're probably too far away from her to make that even work, and it by itself would accomplish nothing if you don't go up and say hello to her.

The correct answer is that on a first date, while the girl is talking to you, you want to look deep into her eyes and imagine having sex with her.  This creates massive sexual tension.

Listening intently in a serious fashion is what "nice guys" generally do.

And looking at your phone or other girls can create jealousy, but can also fluster her, piss her off, and generally create negative vibes.  It's attraction game which you don't really need on a first date.

The correct answer is to assume a girl actually does like you the first time she looks your way.  This is the most confident mindset.

If you wait for the third time she looks at you, you could lose out on a lot of opportunities.

If you wait until you're talking to her, it's a loser's mindset.

You can wait until you have 3 other body language signals from her, but again, you'll lose out on many opportunities if you keep looking for lots of "signs" from her.

It's generally best just to take action early on.

The correct answer is that you should assume she's shy or can't take the social pressure of holding eye contact with you.

Just because she looks away, it doesn't mean she isn't attracted to you, or has a boyfriend-- a lot of girls are just shy.

Generally it's best just to assume she's a bit shy and then go up to her and find out what the situation actually really is.

The correct answer is YES, you can compliment a woman's eyes on a first date.

Normally I'm not crazy about complimenting a woman on her inherent looks- but her eyes are the one exception.  Every woman loves compliments on her eyes.

Generally it's a BAD idea to TEASE her about her eyes, because her eyes aren't something she can change.

And no, you're not giving your power away when you compliment her eyes on a first date.  She already likes you, otherwise she wouldn't have met you on the date.  As long as you don't overdo the compliments, you'll be fine.