Which of the phrases given below the sentence should replace the phrase printed in bold type to make it grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.

The easiest of the thing to do is to ask the address to the postman.

A.

of the things to do

B.

among the things did

C.

of the thing to be done

D.

of all the things done

E.

No correction required

Correct answer is A

No explanation has been provided for this answer.