Using the equation frequency = wave speed/wavelength use the wavelength is 656E-9 meters to calculate the frequency of this photon (remember the...

Using the equation frequency = wave speed/wavelength

use the wavelength is 656E-9 meters to calculate the frequency of this photon (remember the speed of light is 3E8 m/s)

A. 7.6E14 Hz

B. 6.0E14 Hz

C. 4.6E14 Hz

I think the answer is C but I can't figure it out please help correct me if I'm wrong