[单选题]
A simple junction transiso1bmxf)beh9l t v2+y 7tor coiwhp p/tkyaiv) +) q4ez02v4j nsists of three semiconductor sections consisting iy)zpt02/aewpi4v+jq h)v4kof
A. pnp semiconductors.
B. npn semiconductors.
C. either pnp or npn semiconductors.
D. none of the given answers
