Hawaii is the only one of the fifty states that still has active volcanoes, and where these mounds are considered enough of a threat to influence residential zoning laws.
(A) that still has active volcanoes, and where
(B) that still has active volcanoes, where (your answer)
(C) still having active volcanoes and where
(D) where the volcanoes are still active,
(E) where there are still active volcanoes and where (correct)