The passage of the Fifteenth Amendment in 1869 prompted the formation of two major suffrage organizations because

A. it marked a great success for the abolition movement, which many feminists opposed.

B. it granted formerly enslaved men the right to vote, while women were still denied this right.

C. it put a halt to Carrie Chapman Catt's "Winning Plan" and set back the cause of women's suffrage.

D. it granted women the right to vote in Western states but not in Eastern states.

The answer is b

it granted formerly enslaved men the right to vote, while women were still denied this right.

B) It granted formerly enslaved men the right to vote, while women were still denied this right.

Explanation:

During the 1840's, the abolitionist movement and the women's rights movement coincided with each other. Both were fighting for social, legal, and political equality in American society. Many advocates of the women's rights movement used their voice to also fight for rights of African Americans within the US. Despite this reciprocal relationship, only African American men were given the right to vote after the end of the Civil War.

This resulted in the continued fight by women in order to gain the right to vote. Women would not gain the right to vote until 1920.