Answer:
Answer is Option C: African Americans gained important civil rights.
Step-by-step explanation:
'Ivan Earnest Allen Jr.' became the mayor of Atlanta in two terms during the 'Civil Rights Movement' of the 1960s. He played an important role in transforming economically slow growing Old South into a new progressive New South. There was a significant economic and social growth in Atlanta city during his time. He got all white and color signs removed from the city hall.
William B. Hartsfield was the longest serving mayor of Atlanta. He also played a crucial role building alliances during the civil rights movement. There was no violence in the cities like Birmingham and the number of African American increased in politics of Atlanta.
Thus, statement C describes their rule the best.