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:

One of the most significant phenomenons of our time has been the development of cinema.

A phenomenon

B phenomena

C phenomenonna

D phenomenonns

E No correction required

ANS:B - phenomena

No answer description is available.