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(C) In a common emitter $(CE)$ amplifier configuration using an $n-p-n$ transistor:$1$. The base-emitter junction is forward biased to allow current f

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input signal is applied between the base and emitter and the output is obtained between collector and emitter.

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(C) In a common emitter $(CE)$ amplifier configuration using an $n-p-n$ transistor:$1$. The base-emitter junction is forward biased to allow current flow, and the collector-base junction is reverse biased.$2$. The input signal is applied between the base and the emitter, while the output is taken across the collector and the emitter.$3$. The input impedance is generally low, and the output impedance is high.$4$. There is a phase difference of $180^{\circ}$ between the input and output signals.Therefore, option $C$ is the correct statement.

When an $n-p-n$ junction transistor is used as an amplifier in common emitter mode,

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