[单选题]
A p-type semiconductozwfc+fg50ymr/ 3ohsnkg 6f2bf: 0: dr r8 j ,zoyw4mdgwk .w/z; is produced by
A. doping the host crystal with donor impurities.
B. doping the host crystal with accepter impurities.
C. pure crystals of germanium.
D. none of the given answers