When npn transistor is used as an amplifier:

electrons move from base to collector

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holes move from emitter to base

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electrons move from collector to base

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holes move from base to emitter

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Solution

The correct option is A electrons move from base to collector
The above circuit diagram shows an npn common emitter transistor used as an amplifier. The electrons emitted by the emitter move to the base (p-type). A few electrons combine with the holes here and the rest of the electrons are collected by the collector (n-type). Thus electron move from base to collector.
The diagram shows the conventional current direction (from B to E).

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