Question

the congress of racial equality
was led by martin luther king jr.
used boycotts in the 1960s to achieve integration.
used sit - ins in the 1940s to encourage integration.
was led by rev. ralph abernathy.

Explanation:

The Congress of Racial Equality (CORE) was a civil - rights organization. In the 1940s, CORE used sit - ins to encourage integration. Martin Luther King Jr. and Rev. Ralph Abernathy were not leaders of CORE. Boycotts were more associated with other civil - rights campaigns like the Montgomery Bus Boycott rather than being CORE's main 1960s strategy for integration.

Answer:

used sit - ins in the 1940s to encourage integration.