Of the companies which brought about the e-commerce revolution; the online revolution that grew out of people's desire for a more convenient shopping experience, Amazon is the best known of them.
For starters, the question should have a comma and not a semi colon following "revolution". However, since this is in the non-underlined portion, let us assume that there is a comma and evaluate the answer options:A. Amazon is the best known of them
The universe of companies is already established by stating "Of the companies which brought about the e-commerce revolution", there is no need to state "of them" at the end. Eliminate.B. the best known is Amazon
Correct answer.C. the better known of those was Amazon
Two issues. The usage of "of them" is redundant as in option (A). Also, "better known" is incorrect since we are talking about more than two companies - the correct usage would be the superlative form "best known". Eliminate.D. Amazon is better known
"better known" is incorrect since we are talking about more than two companies - the correct usage would be the superlative form "best known". Eliminate.E. the best known one is Amazon
The usage of "one" is redundant since we are using the superlative form "best known". Eliminate.Hope this helps.