Keep in mind that this is an EXCEPT question stem, which means that the correct answer is NOT mentioned in the passage.
Beginning in line 24, the passage reads "The oath is also faulted for its omissions: its failure to mention such vital contemporary issues as human experimentation and the relationship of the physician to other health care professionals." This is exactly the criticism in option choice C. Since this criticism IS mentioned in the passage, we eliminate it as an answer choice.