What challenge faced by farmers during the late 1800s was caused by overproduction of crops

i believe the answer is d- low crop prices : )

D- low crop prices

Explanation:

The productivity of American firms increased not only because the sowing area was expanding, but also due to the development of agricultural engineering. As production was well ahead of consumption, farmers' revenue for the products of their labor began to fall. But, at the same time, prices for the transportation and storage of food began to rise.

i think the answer is a and i hope this ; ))