The answer is C .. the topic sentence
Loss of individualism. If everyone is the same, everything is the same day after day in a cubicle with no windows or distinct decor differing from one room to the next, there is no individuality
When Pony is coming back from the movies, he realizes he is alone. His first mistake is that he didn't stop to wait for Darry, Sodapop, or one of the gang members to go with him to the movies. This results in him walking home alone, which in turn makes him easy bait. He then gets jumped by the Socs, all because he didn't wait for someone else to go with him.