单选题 The arguments that cloning will have harmful effects ______.

A、 are very convincing
B、 have forced people to stop cloning
C、 have forced people to question the concept of cloning
D、 have compelled people to debate the implications of cloning

【正确答案】 A

【答案解析】第一段中讲到"compelling arguments state...effects on both groups．"，所以克隆会产生有害结果这一论断是很令人信服的，有说服力的，因而选A。B选项文中并未提到。选项C和 D错在颠倒了原因和结果，应该是对克隆的争论得出了克隆会产生有害结果这一结论。