When you and that person connect. When I notice the little things and remember small details I know that I'm into them. And that's why when they care about and do the little things they become more attractive. Put looks aside, as long as you are good to the other person they will start to like you. And the more they like you the more attractive you will become to them regardless
I believe the answer is C because if you looking for dog pictures and end up looking at cat pictures you went off topic, since you went to look at dog pictures. Its the same when you go looking for research on a topic.