All of the above are true.
B.) To explain his economic agenda and give hope to the American people.
Marcus Garvey was a descent of Jamaican, a leader of the Pan-Africanism movement and founder of Universal Negro Improvement Association.
Marcus Garvey was a Black-American which sought to unify and connect the people of African descent worldwide.
He was very popular for organizing the U.S. first Black nationalist movement after the WWI where he advised the blacks to be proud of their identity.
Therefore, Option C is correct because he promoted black cultural pride and economic independence.
Learn more about Marcus Garvey here
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Because the old slaves were not prepared for that kind of work