In the circuit shown, the resistance of voltmeter is 10,000 ohm and that of ammeter is 20 ohm. The ammeter reading is 0.10 ampere and voltmeter reading is 12 volt Then R is equal to

• A

  $122\Omega$

• B

  $140\Omega$

• C

  $116\Omega$

• D

  $100\Omega$