The answer is A: Disenfranchisement.
Explanation for each option:
A. Disenfranchisement: This term refers to the revocation of someone's right to vote. In the context of the Post-Reconstruction Era South, disenfranchisement was a significant issue as many African Americans were systematically denied the right to vote through various means such as literacy tests, poll taxes, and other discriminatory practices.
B. Disappointment: This term refers to the feeling of sadness or displeasure caused by the non-fulfillment of one's hopes or expectations. It does not relate to the revocation of voting rights.
C. Dissonant: This term is used to describe a lack of harmony or agreement, often in a musical context. It does not pertain to the revocation of voting rights.
D. Disillusionment: This term refers to the feeling of disappointment resulting from the discovery that something is not as good as one believed it to be. While it can be related to the emotional response to disenfranchisement, it does not specifically refer to the act of revoking voting rights.
Therefore, the correct answer is A: Disenfranchisement.