Movement.... i think there is a theory to it ....
I believe this is D! Hope it helps you in any way.
Answer 1: The hammer and symbol represent the proletarian solidarity
Answer 2: The image isn't their so I think It might be Hitler
Answer 3: Not sure because I cant see that earthier
The answers for the blanks can be either "increase" and "decrease" or "encourage" and "discourage."