Which of the following frequencies falls in the range of RF waves used by commercial radio broadcasting stations?
A. 600,000 Hz
B. 60 Hz
C. 6,000,000 Hz
D. 6,000 Hz
On page 103 it explains that The radio frequencies used by  commercial radio broadcasting stations range from about 550,000 Hz to 1,700,000 Hz. So the correct answer is A. 600,000 Hz