[单选题]
A simple junction transistor consists of thr91qw -hfl.;fp5/ms oi um/)wzdyb2ot gjj/7coj hq89k 1cs8 eee semiconductor sections consisting of j9qo8cskh1g87/jj e c
A. pnp semiconductors.
B. npn semiconductors.
C. either pnp or npn semiconductors.
D. none of the given answers
