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 responses highlight the contrasting views of Rebecca and Mama, as well as their emotional states regarding the discussion on Sojourner Truth and the issues of freedom and women's rights.