Final answer:
Ella Baker is the civil rights veteran who helped create the SCLC with MLK and later formed the SNCC, focusing on the importance of voter registration in the civil rights movement.
Step-by-step explanation:
The civil rights veteran and key figure in creating the Southern Christian Leadership Conference (SCLC) with Martin Luther King Jr. in 1957, who also later formed the Student Nonviolent Coordinating Committee (SNCC) and advocated for voter registration, is Ella Baker. Option 2: Ella Baker is the correct answer.
Ella Baker's work was crucial in facilitating grassroots organization and empowering local communities, which was integral to the civil rights movement, particularly in the context of voter registration and participation. Her emphasis on participatory democracy and local activism was important for sustaining the movement, especially after the passage of key legislation like the Civil Rights Act of 1964 and the Voting Rights Act of 1965.