I would say B. It inspired him to do it by the looks of things so A wouldn't make sense. C doesn't either. I don't think excited would make sense in the sentence, so B would make the most sense. Hope that helps.
Your answer is a, opinions expressed should be supported by important facts, examples, or personal experiences.
The falling action is everything that comes after the part of him crying at the milk bar and feeling guilty. Basically everything after the line, "When the crying spell passed, he wiped his eyes and face with his hankerchief, feeling relieved."
An example could be an essay on the latest shoes and why you should buy them