Choice D is the best answer. In the passage, Sara T. Smith addresses the Second Anti-Slavery Convention of American Women. In the second sentence of the first paragraph, Smith states that confronting slavery is "a question of justice" and that it involves "considerations of immense importance to the welfare and prosperity of our country." In the third paragraph, Smith argues that women shouldn't be deterred from participating in the abolitionist cause. In the last paragraph, she argues that women "cannot remain inactive" in confronting slavery as "our country is as dear to us as to the proudest statesman. . . . Let our course, then, still be onward!" Therefore, Smith's main purpose in the passage is to encourage women to see their participation in the abolitionist cause as just and important.
Choices A and C are incorrect because Smith doesn't accuse fellow abolitionists of overlooking the contributions that women have made to the movement (choice A) or make the case that women's rights are meaningless while slavery exists (choice C). Choice B is incorrect. Although Smith quotes the Declaration of Independence in the third paragraph, the main purpose of the passage isn't to argue that the causes of abolition and women's rights are continuations of the spirit of the American Revolution.