Based on their views and methods of activism, Robert and Carol would likely have joined different organizations that aligned with their approaches to civil rights.
Carol, who wanted to participate in sit-ins at lunch counters and was focused on enforcing desegregation in schools, may have joined organizations like the Student Nonviolent Coordinating Committee (SNCC) or the Southern Christian Leadership Conference (SCLC), both of which were involved in nonviolent direct action and protests, particularly in addressing issues of desegregation.
Robert, who preferred organizing letter-writing campaigns and marches and aimed to improve broader social, political, and economic opportunities for African Americans, might have been inclined to join the NAACP (National Association for the Advancement of Colored People) or similar organizations that focused on legal challenges, advocacy, and broader systemic change.
Thus, Carol would likely join more direct-action-oriented groups like the SNCC, while Robert would align with advocacy and legal organizations such as the NAACP.