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 as a non - violent protest method 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.

Answer:

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