What does the above chart indicate about the economic situation of many southerners

There exists the same question from other source with the following choices:

A: Many southerners depended too heavily on industry.
B: After the civil war, many southerners struggles financially.
C: The civil war and reconstruction had little effect on the south.
D: Southerners needed to focus more on cotton production

The correct answer to this question is letter "A: Many southerners depended too heavily on industry."

Ithink the answer is c