[单选题]
A simple junction transiszydjs;mnbk +u*h * rblecuyc.cc6,(v a ;.96f tor consists of three semiconhtu5j6e jnx.k ,fk0(bductor sections consisting x, e05kfhu kt(6bnj.jof
A. pnp semiconductors.
B. npn semiconductors.
C. either pnp or npn semiconductors.
D. none of the given answers