C. Importance of history. The poem mentions in the first two and final two stanzas how important the even was in the past. By depicting its importance, the poem warns us not to forget our history
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Gates' purpose in telling the story about watching Nelson Mandela walk out of prison was to illustrate that there's hope for humanity.
Nelson Mandela was an activist. He fought for apartheid and discrimination against blacks in South Africa. He fought for the freedom of black people. This eventually led to his imprisonment.
Later he was eventually set free from prison. This represented hope to the people. It illustrated that we are all equal. This illustrated that there's hope for humanity.
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Since nothing is underlined, I am going to make an educated guess that the underlines clause is "who had worked with the business person". If that is the case, the correct answer would be D - adjective clause. It is a relative clause, to be more precise, because it starts with a relative pronoun "who", but that is a part of adjectival clauses, so that is the correct answer.
The answer is A :)
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