Since people in the south, relied heavily on agriculture and lagged behind on manufacturing, how did they get the goods they needed?

A they just did without goods they needed
B they made everything themselves
C they rely heavily on imports from the north and Europe

C they rely heavily on imports from the north and Europe

Is that the right answer?

Yes, that is the correct answer. People in the South relied heavily on imports from the North and Europe to obtain the goods they needed, as they were not as industrialized as the North and therefore did not have as many manufacturing capabilities.