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C. A radio interview with the person.

Explanation:

An opinion article might be written by another person, and they might be biased, which would not be reliable information. There's a chance that a biography about the radio host would not have true facts in it because it's somebody else writing the biography, not the actual host. A piece of historical fiction about the life of the person being interviewed would definitely not be reliable because the key work is fiction. Fiction is made up, so it's not real. The most accurate choice would be a radio interview with the person because the the person being interviewed would share their real thoughts and feelings.

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explanation: