The central idea can be seen in the sentence where Anthony compared the situation of enslaved African Americans with that of women, as shown in option B.
Antony compared the plight of African Americans with the plight of women, to show how neglected these two groups are by the government that has sworn to protect them all.
She showed that African Americans have been prevented from living freely and that this lack of freedom is also noticeable in women and, therefore, the suffragette struggle is similar to the abolitionist struggle.
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