Which of the following statements about john d. rockefeller is most accurate?
a. he drilled the first oil well near titusville, pennsylvania.
b. he invented the concept of vertical integration.
c. he founded the standard oil company when he was 24 years old.
d. he considered competition to be the central ideal of capitalism.

i believe it is capitalists.  

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.