The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.
The governing board of the new league has modified its rules so that pre-existing teams can stay together even though not all their members meet the new minimum age requirement.（）
A. not all their members meet the new minimum age requirement
B. the new minimum age requirement has not been met by all their members
C. not all their members have met the new minimum age, as required
D. all their members have not met the new minimum age requirement
E. all their members do not meet the new minimum age requirement