[单选题]
17.16: Which one of thn d+.e4q;a y+m p0xcajp2o,nie following choices best represents the type of elecx:/5 tccitlr5 pe+a p1tromagnetixca/pt 1p:+c55 trlie c wave associated with a frequency of $10^{18}Hz$?
A. AM radio
B. microwaves
C. ultraviolet light
D. is X rays
E. red light
