Since the "Daisy Girl" Political Advertisement in 1964, We Have

Since the "daisy girl" political advertisement in 1964, we have seen _________________ because _________________.

A) a decline in negative advertising; it is perceived as having little or no effect
B) a decline in negative advertising; it only harms the campaign that "goes negative"
C) an increase in negative advertising; it is perceived as effective
D) a decline in both positive and negative political advertising; they are perceived as ineffective
E) a decline in both positive and negative political advertising; they are too costly