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:

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

ANS:B - appreciated the method adopted

No answer description is available.