Works like the autobiography of Olaudah Equiano helped expose

He published his autobiography, The Interesting Narrative of the Life of Olaudah Equiano (1789), which depicted the horrors of slavery. It went through nine editions in his lifetime and helped gain passage of the British Slave Trade Act 1807, which abolished the slave trade.

Explanation:

In 1786 in London, he became involved in the movement to abolish slavery. ... He travelled widely promoting the book, which became immensely popular, helped the abolitionist cause, and made Equiano a wealthy man. It is one of the earliest books published by a black African writer.

the answer is c.

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whose power in the senate is equal to the power of the speaker of the house?