A cyclic process $\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{A}$ is shown in the $\mathrm{V}-\mathrm{T}$ diagram. Process on the $\mathrm{P}-\mathrm{V}$ diagram is

From the given $\mathrm{V}\mathrm{T}$ diagram, In process $\mathrm{A}\mathrm{B}$, $\mathrm{V}\propto \mathrm{T}$

The pressure is constant (As the quantity of the gas remains the same).

In process. $\mathrm{B}\mathrm{C}$, $\mathrm{V}=$ Constant

and in process $\mathrm{C}\mathrm{A},\mathrm{ }\mathrm{ }\mathrm{T}=$ constant

So, These processes are correctly represented on the $\mathrm{P}\mathrm{V}$ diagram by graph $\left(\mathrm{C}\right)$.