[单选题]
A simple junction transistor consists of three semie- h86ylme.bp41 v ffcconductor( 4qjo)s;yb4ypwma6 g sections consisting 4 ;mwga6oyqjbs4 y(p) of
A. pnp semiconductors.
B. npn semiconductors.
C. either pnp or npn semiconductors.
D. none of the given answers