Noted statistical consultant W. Edwards Deming, whose approa

Good question to practice. The question sticks with basic grammars tested in real GMAT.

Note:"THAT" never + comma. The rule is: Use THAT (and no commas) if the modifier is essential.

Noted statistical consultant W. Edwards Deming, whose approaches to process control were revolutionary for post-war industrial practices in Japan, was an inspiration in several American management philosophies, that included Total Quality Management and Six Sigma, that only became popular during the twilight of his life

A were revolutionary for post-war industrial practices in Japan, was an inspiration in several American management philosophies, that included Total Quality Management and Six Sigma, that only became popular
Wrong. "THAT" never + comma. The rule is: Use THAT (and no commas) if the modifier is essential.

B was revolutionary for post-war industrial practices in Japan, inspired several American management philosophies, that included Total Quality Management and Six Sigma, that became popular
Wrong.
- "THAT" never + comma. The rule is: Use THAT (and no commas) if the modifier is essential.
- S-V agreement. "was" is wrong.

C revolutionized post-war industrial practices in Japan, inspired several American management philosophies, such as Total Quality Management and Six Sigma that became popular
Correct.

D was revolutionary in post-war industrial practices in Japan, was an inspiration for several American management philosophies, including Total Quality Management and Six Sigma, which became popular
Wrong. S-V agreement problem.

E were revolutionary in post-war industrial practices in Japan, inspired several American management philosophies, that included Total Quality Management and Six Sigma, which became popular
Wrong. "THAT" never + comma. The rule is: Use THAT (and no commas) if the modifier is essential.

Hope it helps.