(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before
(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river
(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before
(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river
答案是C,可是緊臨原則不是說動詞、受詞之間不要有副詞嗎(插入不算)(study the effect),選B會不會比較好,請各位牛牛指點一下,謝謝

因為從word直接剪下來,有時沒發現,謝大大提醒。