Choice C is the best answer. Woolf writes that women "have thought" while performing traditional roles such as cooking and caring for children (lines 67-69,"cloisters...cradle"). Woolf argues that this "thought" has shifted women's roles in society and earned them a "brand-new sixpence" that they need to learn how to "spend" (lines 70-71,"brand...sixpence"). The "sixpence" mentioned in these lines is not a literal coin. Woolf is using the "sixpence" as a metaphor, as she is suggesting women take advantage of the opportunity to join the male-dominated workforce.
Choices A, B, and D are incorrect because in this context, "sixpence" does not refer to tolerance, knowledge, or perspective.