another question

justforuUID: 2238767

Although schistsomiasis is not often fatal, it is so debilitating that it has become an economic drain on many developing countries.
(a) it is so debilitating that it has become an economic
(b) it is of such debilitation, it has become an economical
(c) so debilitating is it as to become an economic
(d) such is its debilitation, it becomes an economical
(e) there is so much debilitation tat it has become an economical

the key is A, but why not to choose C?
thanks.

DajUID: 18915

C is fishy

A is much better than C


hehe ........