[单选题]
17.16: Which one of the fol1 2,bht pai6zalowing chx2ihqh y1n;7 goices best represents the type of electromagnetic wave associated withx172hh;gnq iy a frequency of $10^{18}Hz$?
A. AM radio
B. microwaves
C. ultraviolet light
D. is X rays
E. red light
