The niagara movement led to the formation of the a. united negro improvement association. b. national association for the advancement of colored people. c. anti-defamation league. d. negro factories association.

The Niagara Movement led to the formation of the National Association for the Advancement of Colored People.  Option B is correct.

The Niagara Movement was a civil-rights group founded in 1905 near Niagara Falls. The movement was essentially a black civil rights organization, which aimed to integrate the African Americans and to secure and grant them equal rights in the society.

Eventually, this movement gave way to the National Association for the Advancement of Colored People which continued the fight for rights of the black communities.

your answer would be (a)