In the circuit shown, the cells are ideal and of equal emfs. The capacitance of the capacitor is C and the resistance of the resistor is R. Xis first joined to Y and then to Z. After a long time, the total heat produced in the resistor will be

• A

  equal to the energy finally stored in the capacitor

• B

  half of the energy finally stored in the capacitor

• C

  twice the energy finally stored in the capacitor

• D

  4 times the energy finally stored in the capacitor