Like other educators who prefer to substitute anthologies of short stories or collections of popular essays to dull “basal readers,” Ms. Burton emphasizes how important it is to enjoy good literature.
(A) to dull “basal readers,” Ms. Burton emphasizes how important it is to enjoy
(B) for dull “basal readers,” Ms. Burton emphasizes the importance of enjoying
(C) to dull “basal readers,” Ms. Burton emphasizes that it is important to enjoy
(D) for dull “basal readers,” Ms. Burton’s emphasis is that it is important to enjoy
(E) to dull “basal readers,” Ms. Burton’s emphasis is on the importance of enjoying

Why not C?