What Flaw Existed in the Confederacy's Strategy for Victory

What flaw existed in the Confederacy's strategy for victory?

A) Their offensive strategy was unrealistic because of the huge size of the North.
B) They could not achieve the overwhelming conquest that their leaders had demanded.
C) Their defensive strategy contradicted their desire to conquer the major cities of the North.
D) They did not possess enough resources to stay the course of their defensive strategy.