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.
Intrigued by the new rules that favored quickness over strength, the decision of the coach was to give more playing time to the team’s smaller athletes.（）
A. the decision of the coach was to give more playing time to the team’s smaller athletes
B. the coach decided to give the team’s smaller athletes more playing time
C. it was decided by the coach to give the team’s smaller athletes more playing time
D. the team’s smaller athletes were given more playing time by the coach
E. more playing time was given to the team’s smaller athletes by the coach
2NH3(g) 。下列说法中，表明这一反应已经达到化学平衡状态的是（ ）