又一疑问,请前辈指点~~

The lack of complete historical records from the mid-to-late 1800's have made some

Black inventions difficult to trace to their originators.

(A)have made some Black inventions difficult to trace to their originators

(B)have made for difficulties in tracing  some  inventions  by Black to their originators

(C)have made  it difficult to trace some inventions by Black to their originator

(D)has made it difficult to trace some inventions to their Black originators

(E)has made it difficult  in tracing some Black inventions to their originators

啥疑问啊……？

建议楼主以后把题目出处和题号标一下以方便后人哈~~

ok, 下次我会注意的~~这题我找不到在那里了,晕..只记得是新东方网络课程.

请问选d还是E, 原因是?