A common emitter transistor amplifier has a current gain of $50$. If the load resistance is $4 \mathrm{k\Omega }$ and input resistance is $500 \mathrm{\Omega }$ .then the voltage gain of the amplifier is

• A

  $160$
• B

  $200$
• Correct answer
  C

  $400$
• D

  none

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