The reform movement Susan B. Anthony promoted when she gave this speech is "expanding the right to vote to all female American citizens."
This is because during the time Susan B. Anthony made this statement or speech; the Constitutional amendment only allows male citizens to vote while restricting female citizens.
However, Susan B. Anthony, who was famous for being a social reformer and women's rights activist, especially on voting rights of women, was in this speech saying that the natural rights are not limited to men alone but extend to everybody, including women.
Hence, in this case, it is concluded that the correct answer to the question is option C. "expanding the right to vote to all female American citizens."
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