Suppose that the cross price of demand between hot dogs and mustard is -2 . This means that hot dogs and mustard are ...... and that th quality of hot dogs purchased will if the price of mustard falls 20 precent A) substitutes , rise by 20 precent B) complements , fall by 20 precent C) substitutes rise by 40 precent D) substitutes fall by 20 precent E) complements rise by 20 precent F ) complements rise by 40 precent