D. The Soviet Union and Chinese helped Korean communists gain power in the north.
In hiding, I'd say first of all she missed her friends, her cat, and normal life. She also missed "riding her bike, hearing the birds sing, getting a fresh breath of air, and laughing out loud with her friends". (SOURCE: http://www.kawvalley.k12.ks.us/schools/rjh/marneyg/03_holocaust-projects/03_wright_anne%20frank.htm )
The desire among americans to return to the prewar days
To ensure that no single branch became too powerful
It killed almost 50% of the population. They were devastated. Because there was no cure for it, they turned their faith towards God.