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一项调查显示，某班参加挑战杯比赛的同学，与那些未参加此项比赛的同学相比，学习成绩一直保持较高的水平。此项调查得出结论：挑战杯比赛通过开拓学生的视野，增加学生的学习兴趣，激发学生的创造潜力，有效地提高了学生的学习成绩。以下哪项如果为真，最能加强上述调查结论的说服力？
A．没有参加挑战杯比赛的同学如果通过其他活动开拓视野，也能获得好成绩。B．整天在教室内读书而不参加课外科技活动的学生，他们的视野、学习兴趣和创造力都会受到影响。C．没有参加挑战杯比赛的同学大都学习很努力。D．参加挑战杯比赛并不以学习成绩好为条件。E．参加挑战杯比赛的同学约占全班的半数。
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