1 answer
(click or scroll down)
The correct answer, "the Confederacy could no longer get supplies from its western states," accurately explains how the capture of Port Hudson and the surrender at Vicksburg divided the Confederacy. This blockade of supplies from the western states played a crucial role in weakening the Confederacy's ability to sustain their war efforts.
On the other hand, your answer, "the Confederacy lost its collective will to continue fighting," is incorrect. While it is true that military defeats like the fall of Port Hudson and Vicksburg could have had psychological effects on the Confederacy, it was primarily the loss of access to crucial supplies that had a tangible impact on their ability to sustain the war. Your answer does not directly address this aspect of the question, which is why it is considered incorrect.