Choice C is the best answer. Woolf characterizes the questions she asks in lines 53-57("For...men?") as significant ("so important that they may well change the lives of all men and women for ever," lines 52-53,"so ...for ever") and urgent ("we have very little time in which to answer them," lines 48-49,"And... them"). Therefore, Woolf considers the questions posed in lines 53-57("For...men?") as both momentous (significant) and pressing (urgent).
Choice A is incorrect because Woolf characterizes the questions as urgent and important, not as something that would cause controversy or fear. Choice B is incorrect because though Woolf considers the questions to be weighty (or "important"), she implies that they can be answered. Choice D is incorrect because Woolf does not imply that the questions are mysterious.