Which of the following is considered as minority carrier in an NPN transistor?

Which of the following is considered as minority carrier in an NPN transistor? Correct Answer Holes

An  NPN transistor has electrons as majority charge carriers and holes as the minority charge carriers whereas the PNP transistor has holes as the majority charge carriers and electrons as the minority charge carriers. 

The mobility of N-type charge current carriers (negative electrons) in silicon (Si) is more than two times greater than the mobility of P-type charge carriers (positive holes) in Si resulting in faster transistor operating speed.

That is why NPN transistor has better high-frequency response than PNP transistor.