Answer: B.) sentence 2
Step-by-step explanation:
The best sentence that can be described as the speaker's thesis is sentence 2, "It shall be my work this evening to prove to you that in thus voting, I not only committed no crime, but, instead, simply exercised my citizen's rights, guaranteed to me and all United States citizens by the National Constitution, beyond the power of any state to deny." This sentence lays out the speaker's main argument, which is that she has a right to vote as a citizen of the United States and that the state does not have the power to deny her this right. This thesis is then developed throughout the rest of the speech, with the speaker citing the preamble of the Constitution and pointing out that women, as well as men, are included in "we, the people" who formed the Union.