Final answer:
Eleanor Roosevelt publicly resigned from the DAR after they refused to let Marian Anderson perform, (option B) thereby taking a significant stand for civil rights.
Step-by-step explanation:
When Eleanor Roosevelt heard that African-American singer Marian Anderson was not allowed to perform at the Daughters of the American Revolution (DAR), she took a decisive stand for civil rights. Disappointed by the DAR's decision to discriminate based on race, Eleanor Roosevelt chose to publicly resign from the organization. Furthermore, she facilitated a landmark concert featuring Marian Anderson on the steps of the Lincoln Memorial, asserting her position as a vital figure in the advancement of civil rights during that era.