Today I came across an easy, but a very good question.
One legacy of Madison Avenue's recent campaign to appeal to people fifty years old and over is the realization that as a person ages, their
concerns change as well.
A. the realization that as a person ages, their
B. the realization that as people age, their
C. to realize that when a person ages, his or her
D. to realize that when people age, their
E. realizing that as people age, their
I really liked the question and specially the takeaway (probably a lesser used), which can be applied to other eligible questions to quickly eliminate the incorrect options. so, here is the takeaway: Noun + to be[am/is/are/was/were/be/been/being] + noun/adjective
legacy is a noun, so it can be matched only with a noun. so, as per this rule, legacy cannot be matched to "to realize" or "realizing". straightaway eliminate C,D,E. These options contain other flaws[usage of when is inappropriate) as well.
consider a simple example:
The change was
good for me correct noun+was+adjective
The change was when I started preparing for GMAT. incorrect
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