Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

Technology must use to feed the forces of change.

A must be used to feed

B must have been using to feed

C must use having fed

D must be using to feed

E No correction required

ANS:A - must be used to feed

No answer description is available.