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A transistor is used in a common-emitter mode in an amplifier circuit. When a signal of \( 20 \mathrm{mV} \) is added to the base-emitter voltage, the base current changes by \( 20 \mu \mathrm{A} \) and the collector current changes by \( 2 \mathrm{~mA} \). The load resistor in \( 5 \mathrm{k} \Omega \).
the input resistance is
(A) \( 1 \mathrm{k} \Omega \)
(B) \( 2 \mathrm{k} \Omega \)
(C) \( 3 \mathrm{k} \Omega \)
(D) \( 4 \mathrm{k} \Omega \)
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