Choice B is the best answer. In lines 72-76("Let... funerals"), Woolf repeats the phrase "let us think" to emphasize how important it is for women to critically reflect on their role in society. Woolf states this reflection can occur at any time: "Let us think in offices; in omnibuses; while we are standing in the crowd watch-ing Coronations and Lord Mayor's Shows; let us think . . . in the gallery of the House of Commons; in the Law Courts; let us think at baptisms and marriages and funerals."
Choices A, C, and D are incorrect because in lines 72-76("Let... funerals") Woolf is not emphasizing the novelty of the challenge faced by women, the complexity of social and political issues, or the enjoyable aspect of women's career possibilities.