详解
Choice A is the best answer. In the first sentence of the second paragraph, Smith relays the sentiment, presumably voiced by those opposed to women abolitionists, that "woman 'can take no part [in the debate over slavery] without losing something of the modesty and gentleness which are her most appropriate ornaments.'" Smith opposes this view in the following sentence: "must woman necessarily be less gentle because her heart is open to the claims of humanity, or less modest because she feels for the degradation of her enslaved sisters, and would stretch forth her hand for their rescue?" The leading tone of this rhetorical question makes it clear that Smith would answer it with a "no." Thus, Smith argues that it is possible for women to act according to humanitarian principles while preserving their femininity.
Choices B, C, and D are incorrect because Smith doesn't argue that it is possible for women to adhere to personal morality while being politically neutral (choice B), contribute to their family's financial security while meeting social expectations (choice C), or resist calls for war while still opposing slavery (choice D).