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:

If I would have realised the nature of job earlier, I would not have accepted it.

A If I have had

B In case I would have

C Had I been

D Had I

E No correction required

ANS:A - If I have had

No answer description is available.