One mole of a monatomic ideal gas undergoes four thermodynamic processes as shown schematically in the $PV$-diagram below. Among these four processes,one is isobaric,one is isochoric,one is isothermal and one is adiabatic. Match the processes mentioned in List-$I$ with the corresponding statements in List-$II$.

List-$I$	List-$II$
$P$. In process $I$	$1$. Work done by the gas is zero
$Q$. In process $II$	$2$. Temperature of the gas remains unchanged
$R$. In process $III$	$3$. No heat is exchanged between the gas and its surroundings
$S$. In process $IV$	$4$. Work done by the gas is $6 P_0 V_0$

• A
  $P$ $\rightarrow 4, Q$ $\rightarrow 3, R$ $\rightarrow 1, S$ $\rightarrow 2$
• B
  $P$ $\rightarrow 1, Q$ $\rightarrow 3, R$ $\rightarrow 2, S$ $\rightarrow 4$
• C
  $P$ $\rightarrow 3, Q$ $\rightarrow 4, R$ $\rightarrow 1, S$ $\rightarrow 2$
• D
  $P$ $\rightarrow 3, Q$ $\rightarrow 4, R$ $\rightarrow 2, S$ $\rightarrow 1$