Which of the following led to the development of the Black Power Movement? A. Watts Riots
B. assassination of Malcolm X
C. lack of enforcement of Civil Rights Act
D. enforcement of voter qualification tests

i think its b hope this helps

B. assassination of Malcolm X

Explanation:

Malcolm X, born as Malcolm Little, and whose full official name was El-Hajj Malik El-Shabazz, was a speaker, religious minister and American activist. He was an advocate for the rights of African Americans, a man who harshly accused white Americans of their crimes against their black compatriots. Instead, his detractors accused him of preaching racism and violence. He has been described as one of the most influential African-Americans in American history. After the death of his father and his mother was hospitalized in a psychiatric hospital, Malcolm spent a period of his youth in prison for interacting with the world of organized crime. When he regained his freedom, he traveled extensively throughout Africa, the Middle East and even visited the Soviet Union. These trips changed his vision of the world and the struggle for civil liberties. He founded the Muslim Mosque, Inc., an Islamic organization, and the secular Organization of African-American Unity. Less than a year after leaving the Nation of Islam, Malcolm X was killed before giving a speech in New York.

Hope this helps

it is a better alternative