The correct answers on Edgen are:
(1.) restoration of law and order
(3.) withdrawal of US forces from Vietnam
I just answered the question and these are right.
C. To prevent starving to death
This is what I think is the right answer
A historian using the thinking skill of primary source analysis might try to "get in the mindset" of the writer or speaker of the source in question, in order to gain more insight into their life and environment.