In this example, we are looking for subject-verb agreement. The first part of the sentence indicates that we are looking for something that happened in the past, hence the reference even fifteen years later. Some men and women is a plural subject, choices B and C have a singular subject and can therefore be eliminated. Choice A is in the present tense, and we are looking for an action that occurred in the past. Choice E is incorrect because it uses as instead of when, which would indicate a comparison that is not being made between some men and women. D is the best answer, using the past tense with a plural subject.
"Start By Doing What Is Necessary ,Then What Is Possible & Suddenly You Will Realise That You Are Doing The Impossible"