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.

He admired the speed with which he completed the work and appreciating the method adopted by him

A.

appreciate the method being adopted

B.

appreciated the method adopted

C.

appreciate the method of adoption

D.

appreciated the method adopting method

E.

No correction required

Correct answer is B

No explanation has been provided for this answer.