E. It justifies the authors’ efforts to define science by emphasizing the flaws of existing definitions.
Explanation:
Answer E
Correct. The authors repeat the phrase “which they are not” in the context of elaborating on their opening assertion that “Science is often defined inadequately.” In this context, they describe two definitions of science, bluntly asserting that each definition would include some types of knowledge “which . . . are not” at all scientific. The repetition of this phrase thus serves to emphasize the inadequacy of existing definitions of science, demonstrating the need for the new definition that the authors go on to provide.e.