A gas is compressed from a volume of $\;2\;m^{3}\;$ to a volume of $\;1\;m^{3}\;$ at a constant pressure of $\;100\;N/m^{2}\;$.Then it is heated at constant volume by supplying 150 J of energy . As a result , the internal energy of the gas is :

Question

(a) Increases by 2 J(b) Decreases by 250 J(c) Increases by 50 J(d) Decreases by 2 J