Answer:
The answer is B because The context clue you would use if you did not know the meaning of the word atrocious is the fact that The D.A.R. was unsupportive of African American performers. One can assume that if the group is unsupportive that they would have made the experience extremely difficult for Marian Anderson.
A thesis statement focuses your ideas into one or two sentences. It should present the topic of your paper and also make a comment about your position in relation to the topic. Your thesis statement should tell your reader what the paper is about and also help guide your writing and keep your argument focused.