The two correct answers regarding the purpose of Rebecca's monologue for the plot are:
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Mama’s preceding line and her reaction to Rebecca’s monologue help show the audience the divide between mother and daughter.
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The monologue reveals how both Rebecca and Mama really feel about Sojourner Truth.
These options highlight the tension between the characters and their differing views on important societal issues, which is central to their relationship and the development of the plot.