Okay so it's pretty easy to boil it down to C and D. While the prof is not explicitly criticizing these authors but he is surely saying that they are "less respectful", a mild criticism. In option C, you are basically assuming that most talented == best. Which is not necessarily the case. I can argue that Gukesh is the most talented chess player but Carlsen is the best. Best and most talented don't necessarily mean the same. Isn't that a rather obvious flaw in option C? I'm assuming this is not an official question, I doubt the GMAT would be this dubious in its wording.
Professor: The best users of a language are its great authors. However, these authors often use language in ways that are innovative and idiosyncratic, and are therefore less respectful of the strictures of proper usage than most of us are.
The Professor’s statements, if true, most support which one of the following?
(A) People who want to become great writers should not imitate great authors’ use of language.
(B) Writers who do not observe proper language usage risk developing a peculiar or idiosyncratic style.
(C) Those most talented at using a language are not as likely as most other people to observe proper language usage.
(D) People who use an innovative or idiosyncratic writing style often incur criticism of their language usage.
(E) The standard for what constitutes proper language usage should be set by the best users of a language.