In the Compton Effect, a Photon of Wavelength $\lambda$ And Frequency F Hits an Electron That Is Initially at Frequency

Multiple Choice

In the Compton effect, a photon of wavelength $\lambda$ and frequency f hits an electron that is initially at rest. Which one of the following occurs as a result of the collision?

A) The photon is absorbed completely.
B) The photon gains energy, so the final photon has a frequency greater than f.
C) The photon gains energy, so the final photon has a wavelength greater than $\lambda$ .
D) The photon loses energy, so the final photon has a frequency less than f.
E) The photon loses energy, so the final photon has a wavelength less than $\lambda$ .