Final answer:
Option (D), The net result of an amorphous selenium layer being struck by an X-ray photon in a direct-to-digital radiographic system is the creation of a latent image.
Step-by-step explanation:
When a thin layer of amorphous selenium is struck by an X-ray photon in a direct-to-digital radiographic system, the net result is the creation of a latent image. This process does not involve the generation of characteristic X-rays, the emission of visible light, or the conversion of X-rays to gamma rays. Instead, the X-ray photon's interaction with the selenium layer causes the electrons within the selenium to be excited, leading to the capture of the image in the form of a latent image, which can then be processed and turned into a visible digital image.