In the early 1930s, why did so many farmers lose their land?

The correct answer is:  

They could not earn enough from farming to pay their mortgages.

During the Great Depression, farm foreclosures became a rising problem. Within 1929 and 1933, the third part of American farmers lost their farms. They were in deep debt, some holding a mortgage and others requiring credit to maintain production. The declining crop prices made it imposible for them to pay off their mortgage loans.

a. competition between france and england for land and power