Answer:
D. She describes Marian Anderson singing at the Lincoln Memorial as well as many of her other successes that were instrumental in the struggle for racial equality.
Explanation:
The correct answer is:
D. She describes Marian Anderson singing at the Lincoln Memorial as well as many of her other successes that were instrumental in the struggle for racial equality.
This sentence best states how the author develops the point that Marian Anderson was part of the Civil Rights Movement by highlighting both a specific, symbolic event (the Lincoln Memorial performance) and her broader contributions to the movement through her career successes.