The best topic sentence to introduce a paragraph containing these details is this:
2. Marian Anderson was a talented singer whose career benefited from the patronage of Eleanor Roosevelt.
A topic sentence refers to a group of words found at the beginning of a paragraph that is aimed at introducing the main ideas that will be discussed in detail in the course of the text.
From the details mentioned above, we can see clearly that Marian Anderson was a singer who was helped by Eleanor Roosevelt to gain some recognition in the scheme of things. So, we can include a topic sentence in the introductory part of the text that shows this fact.
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