To gain passage of his civil rights legislation, johnson had to a. accept weaker versions of the bills. b. appoint judges who favored civil rights. c. limit civil rights demonstrations. d. overcome senate filibusters.

The correct answer is d. overcome senate filibusters.

Filibusters are politicians who debate and talk so much on something that they use all the allotted time and the bill is then either delayed or eventually after enough filibustering it's not even passed. There were many filibusters from the south and he had to introduce an act to reduce filibustering in order to get the civil rights act passed.