What was Martin Luther King Jr. primarily known for?

Martin Luther King Jr. is primarily known for his pivotal role in the civil rights movement, where he fought for the rights and equality of African Americans and advocated for the end of racial segregation and discrimination. His philosophy of nonviolent resistance and civil disobedience, inspired by Mahatma Gandhi, aimed to bring about social change through peaceful means. He is best known for his leadership during events such as the Montgomery Bus Boycott and the March on Washington, where he delivered his iconic "I Have a Dream" speech.

His efforts were instrumental in the passing of crucial legislation, such as the Civil Rights Act of 1964 and the Voting Rights Act of 1965, which aimed to dismantle institutionalized racism in the United States. This work has had a lasting impact on American society, making him a key figure in the struggle for civil rights and equality for all citizens, especially within the African American community.

The other options highlight movements and advocacy areas that do not align with King's primary contributions. While he supported various social justice initiatives, his most significant efforts were focused on civil rights, making this option the most accurate reflection of his legacy.