A common emitter amplifier has a voltage gain of $50$, an input impedance of $100 \mathrm{\Omega }$ and an output impedance of $200 \mathrm{\Omega }$. The power gain of the amplifier is

• A

  $500$
• B

  $1000$
• Correct answer
  C

  $1250$
• D

  $50$

Hence, the correct answer is option: 'C'.