Final answer:
MLK held his notable protest in Selma, Alabama, culminating in the march from Selma to Montgomery, which was a pivotal event in the Civil Rights Movement.
Step-by-step explanation:
Martin Luther King Jr. held his notable protest in Selma, Alabama, which is option b) Selma, Alabama. This was known as the Selma Campaign, during which a 50-mile protest march from Selma to the state capital of Montgomery took place in response to violent resistance against African American voting rights. The first attempt on March 7, 1965, became known as Bloody Sunday due to the violence that demonstrators faced from state troopers on the Edmund Pettus Bridge. The successful march resumed on March 21, under federal protection, and culminated on March 25 with approximately 25,000 demonstrators joining by the time they reached Montgomery, signaling a major moment in the Civil Rights Movement.