[单选题]
17.16: Which one of the fol ga*bgej.a8be+ ua6e9 lowing choices best represents the typnpb+c1f n93i2vir8uq e of electromagnetic wave associated iuv2ifbr89q1n c3n+ pwith a frequency of $10^{18}Hz$?
A. AM radio
B. microwaves
C. ultraviolet light
D. is X rays
E. red light
