(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 that it has become an economical
Solution:
Parallelism*
B is wrong due to the usage of it is of such debilitation and misses the much needed that.
C is wrong due to so debilitating is it
D is wrong due to it becomes.
E is awkward.
A is the best choice.
Sentence Correction - 1000 Questions with Solution: