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:

This is one of the most important inventions of this century.

A invention of this century

B invention of these century

C invention of centuries

D invention of the centuries

E No correction required

ANS:E - No correction required

No answer description is available.