In the Southern colonies, what was the economy mostly based on? A
shipbuilding
B
producing iron and textiles in factories
C
whaling and fishing
D
producing cash crops on large farms

Your answer should be D: producing cash crops on large farms

Explanation:

The south was still based on agriculture unlike the north which was based on economy. Hope this helps :)

because it took place after the war of 1812 had come to an end.