几道语法题1

月下无泪UID: 2112432

The fact that economic hardship is the real source of many other problems is why the
- i. e& ^7 i/ V6 ]7 arevolutionary goverment attacked infatoin first.

* o( K6 y* v* o/ z7 i6 f! k  V这句话是不是把is和 why之间加上 the reason就是对的拉？否则就是错的？
+ Q7 ]" C' f) e! y3 ^8 T. k
对画线部分进行修改：
2 In the wild, pygmy chimanzees are found only in an inaccessibel region south of the
aire River, since such is the case, very few are in captivity
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  e& j9 m1 z: q* P( N& uA since such is the case, very few are in captivity
7 F8 X7 ^5 u7 F: hB and very few are in captivity because of that
C no more than  few are in captivity as a reasult
D the number in captivity is very few for this reason
E and so no more than a few are in captivity
答案为E，能解释一下其他选项为什么错了吗？