A cyclic process $\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{A}$ shown in the $V\mathit{-}T$ diagram is performed with a constant mass of an ideal gas. The same process in the $P\mathit{-}V$ diagram is

From the $V\mathit{-}T$ diagram, process $\mathrm{A}$ to $\mathrm{B}$ is an isobaric expansion which is only in option $\mathrm{A}$.

Process $\mathrm{B}$ to $\mathrm{C}$ is isochoric with a decrease in temperature and hence the pressure.

Process $\mathrm{C}$ to $\mathrm{A}$ is an isothermal compression.