B.)
The 2 sentences should be turned into one because if the last sentence is left like that, it would be called a fragment/incomplete sent.
The answer you are looking for is A, member. The other 3 all have to do with being mindful! While a member just refers to a person. Not to mention there is no "or" in member!
Hope this helps!
Answer: If people knew what was happening in the other parts of Panem then they might turn against the capital knowing the horrible living conditions in which say Katniss’s lives in. What people don’t know doesn’t hurt them. So it benefits the Capital by the amount of control they have.
Wishful thinking because he doesn’t know for certain the young man would have died