[单选题]
When a proton passes throuc ui0e)pfp6 rvp5;wf*n eh/ 4fgh matter, it is possible foq8v-z31u35myc u vvtjr it to interact with the matter in such a way thatv5 quu1jv v-ztc833my an electron 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
