What was the main reason that plantations were so profitable?

a. they planted cotton.
b. they used slaves to do all of the hard labor.
c. plantation owners were clever businessmen.
d. the land was so cheap.

i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation:

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.