In "Where Have You Gone, Charming Billy" the narrator was most likely to remember the obituaries of people who were well-known public figures. Option C is correct.
In “Where Have You Gone Charming Billy”, the main character is Private First Class Paul Berlin. The story is set in Vietnam during the Vietnam War. It is Paul's first day and he is having an extremely hard time dealing with his anxiety and fear. One soldier in his platoon has already passed away from a heart attack.
C) Celebrate. This would make better sense, since it isn't having a claim to recognize something when it already is a holiday. Observing something would simply be to inspect. Mark is definitely not your answer and you should know that the last ones available aren't reasonable! So the answer is C)
The speaker is lonely and distanced from the rest of society, which is why he did not speak out. The speaker regrets not speaking out because he was not being targeted and ignored those who were.