Which of the Following Is the BEST Example of Deindividuation

Which of the following is the BEST example of deindividuation?

A) Since all of her friends drink alcohol and smoke cigarettes at parties, Jessica feels that she has an "excuse" to do the same-even though she would normally feel guilty about engaging in these behaviors.
B) Stanner is a teenager who puts on a "front" when hanging out with his friends. In these instances, he does not act true to himself at all and instead seems to be playing a role or acting a part.
C) Anna is a soldier who is so mentally wrapped up in the war that she actually stops thinking about herself as an individual who is separate from her unit and fails to ask herself whether or not she is behaving responsibly.
D) Petra is a novelist who becomes so focused on her writing-she calls it "being in the zone"-that she actually loses track of the day and time, often forgetting to eat dinner.