What evidence supports the claim that the planters in the southern Carolina region could not make rice a profitable crop on their own?

A.Planters decided which fields to plant, what crops to grow, and when to harvest crops.
B.Planters hired white settlers to work in rice paddies to make a profit.
C.Planters had to be self-sufficient because plantations were so far from the coast.

D.Planters relied on the farming skills brought by the enslaved Africans from the rice-growing areas of West Africa.

My answer is C

I have no idea. I haven't studied SC history. Please read/re-read your text and/or use Google.