In an X-Ray Machine,electrons Are Accelerated and Then Fired So

Multiple Choice

In an x-ray machine,electrons are accelerated and then fired so that they are incident on a metal target.Which part of the process produces the characteristic x-ray spectra?

A) The incident electron loses energy.
B) The incident electron knocks an electron out of one of the metal atoms.
C) A vacancy in an energy level in a metal atom is filled.
D) The incident electron emits an x-ray.