USCoal Companies and Coal-Burning Utilities Have Suggested That There Is

U.S.coal companies and coal-burning utilities have suggested that there is something called clean coal.Which statement is false about this product?

A) Stricter pollution controls will not stop the release of some carbon dioxide.
B) Burning coal will always result in production of hazardous ash.
C) One type of coal is significantly cleaner than other types.
D) Climate scientist James Hansen calls coal the single greatest threat to civilization.
E) Air pollutants will always be released by burning coal.