(mc) during the 1920s, american farmers experienced which of these trends?

I think the answer is declining crop prices due to overproduction. During the pre-war era, the US had been the number one food supplier of the European countries. Because of this demand, many land owners had expanded their lands and over produced their crops in order to cater the growing demand. However, when the war finished, countries have started planting in their own soils instead of relying import from the US, thus led to the Great Depression in the US.

They feared germany was trying to develop nuclear weapons.