[单选题]
When a proton passes through matter, it is possiblewhkotu 9x: k/) forz8ajhn4;jn hyl e4+w; it to interact with the matter in such a way that an electron and a positron are produl ;aj8zhhj4+w ;4nney ced; this interaction is referred to as
A. the photoelectric effect.
B. the Compton effect.
C. pair production.
D. none of the given answers
