Why npn-transistors are preferred over pnp-transistors?

Question: Why npn-transistors are preferred over pnp-transistors?
[A].

Leakage current in npn-transistors is less than pnp-transistors

[B].

Mobility of majority carrier in npra-transistors is greater than the mobility of majority carrier in pnp-transistors

[C].

Bias voltage required in npn is less than in/wp-transistors

[D].

Bias voltage required in npn is greater than in pnp-transistors

Answer: Option B

Explanation:

No answer description available for this question.