prep08中的189页的一道补充题不明白

jjksa100

the fact of在GMAT中从未成为过正确选项，必须用that引导同位语从句修饰fact，例：
1.  Chronic low-level leaking and the routine discharge of drilling mud and mineral salts present
considerable environmental risk during offshore oil drilling.
(A) Chronic low-level leaking and the routine discharge of drilling mud and mineral salts present
considerable environmental risk during offshore oil drilling.
(B) The reason offshore oil drilling presents a considerably environmental risk is because of chronic
low-level leaking and the routine discharge of drilling mud and mineral salts.
ChaseDream PREP2008 语法笔记
Practice Test #2
www.chasedream.com  190
(C) A considerable risk to the environment is presented during offshore oil drilling, where low-level leaks
are chronic and the routine discharge of mud and mineral salts.
(D) Offshore oil drilling presents a considerable risk to the environment due to  the fact of  chronic
low-level leaks, and mud and mineral salts are routinely discharged.
(E) Chronic low-level leaking, along with the routine discharge of drilling mud and mineral salts, are what
make offshore oil drilling environmentally risky

这当中B选项的错误是在哪里呢？
是因为The reason... is because of 不够简洁，还是The reason 后要跟why/that？,或者必须是名词性短语呢？

jjksa100

有谁回答我不，谢谢啦

TerraceHo

(B) The reason offshore oil drilling presents a considerably environmental risk is because of chronic
low-level leaking and the routine discharge of drilling mud and mineral salts.

意思應該是：reason presents blah~
但劃綫部份是名詞成份，所以主語應該是the reason offshore oil drilling-->但這個是錯的

p.s.
reason用法
（1）the reason for A——A發生的原因

（2）the reason why B——B發生的原因

（3）the reason that C——C發生的原因

（4）the reason (that) D is that E——D發生的原因是E

（5）the reason of F——F發生的原因