Multi-choice problem: Continue writing the next sentence in this paragraph:

How to start a conversation with someone on the train, bus or subway
Make eye contact.
Making brief eye contact can show the person that you're interested and help you gauge whether they are interested in you. Glance at the person (don't stare) and try to hold their gaze for just a second or two.

Available choices: [-] Try repeating this step for a longer or longer period. If the person shows interest, then you can then proceed to introduce the topic.; [-] Try to keep the eye contact for around ten seconds or less, then pull away. It's okay if you keep his eyes locked to you for a little longer.; [-] Maintain this hold as long as you can. Smile at someone while you talk to them.; [-] Notice how they respond to your eye contact. If they meet your gaze, it's likely positive.;
Notice how they respond to your eye contact. If they meet your gaze, it's likely positive.