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【单选题】
先天的遗传因素和后天的环境影响对人的发展所起作用到底哪一个重要?双胞胎的研究对于回答这一问题有重要的作用。惟环境影响决定论预言，如果把一对双胞胎儿完全分开抚养，同时把一对不相关的婴儿放在一起抚养，那么，待他们长大成人后，在性格等内在特征上，前两者之间决不会比后两者之间有更多的类似。实际的统计数据并不支持这种极端的观点，但也不支持另一种极端观点，即惟遗传因素决定论。 从以上论述最能推出以下哪个结论?（ ）。A.
为了确定上述两种极端观点哪一个正确，还需要做进一步的研究工作
B.
虽然不能说环境影响对于人的发展起惟一决定作用，但实际上起最重要的作用
C.
环境影响和遗传因素对人的发展都起着重要的作用
D.
试图通过改变一个人的环境来改变一个人是徒劳无益的
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