[单选题]
When a proton passes through mata(dga1z0 ( 8zvs or hg/u+txa(e5vf)hter, it is possible fos0l8.krc z0g cr it to interact with the matter in such a way that an elec8z0 .0clcr skgtron and a positron are produced; this interaction is referred to as
A. the photoelectric effect.
B. the Compton effect.
C. pair production.
D. none of the given answers