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Most of the transistors are npn type and not pnp type because—

1. npn transistor gives large voltage gain
2. npn transistors a more negative than pnp transistors
3. In transistor, the current conduction is by free electrons which are less mobile than holes
4. We can have high conduction in npn transistors.

Correct Option: D

Mostly npn transistors are preferred over pnp transistors because the mobility of electron is approximately 2.5 times greater than the mobility of hole, corresponding we can have high conduction in npn transistors.