During the twentieth century, farmers increasingly shifted their focus together as demand for cotton fell. A wheat
B livestock
C. renewable resources
D. fishing

I believe the correct answer is B

Explanation:

During this time their was many technological advancements including better farming equipment and advancements in better soil.

the answer is b just took the test

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.