单选题:What is one of the possible conclusions of the experiment?

题目内容:
What is one of the possible conclusions of the experiment? A.The ideal retirement age for an experienced football referee is 35.
B.Age should not be the chief consideration in choosing a football refere  ┠考试大^o^在线^*^考试中心┨
C.A football referee should be as young and energetic as possibl
D.An experienced football referee can do well even when in poor physical conditio
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