I chose not to do anything. My reasoning was that doing anything - going over to help, getting the zombies to chase you - was going to put yourself in unnecessary jeopardy. Taking emotion out of it, helping that person does nothing for you and only compromises your ability to survive longer.
Do they explain the reasoning anywhere? I'm curious to know how the answers load toward total score.
Like the one where the guy was arguing with the family over who should get the supplies. One of the options was to kill everyone. I don't know if, by answering that, you actually do get to kill them or only that your intent is to kill them and any number of things could happen - for instance, they kill you instead.