Indicate Which One of the Following Sources Produces the Highest $v$

Indicate which one of the following sources produces the highest energy photons.

A) a radio station with $v$ = 106.7 MHz
B) a dentist's X-ray source with $\lambda$ = 100 pm
C) the laser in a CD player with $\lambda$ = 650 nm
D) a microwave oven with $v$ = 6.0 $\times$ 10¹⁰ Hz
E) your cell phone with $v$ = 1.750 GHz