Options:

(A) $\quad$ (B)

(C) $\quad$ (D)

For an ideal gas, PV = nRT.

From A to B, pressure varies linearly with temperature $\rightarrow$ volume must be constant.

From B to C, temperature is constant with decreasing pressure, so its an isothermal expansion.

For C to A, presure is constant and temperature is decreasing, and so is volume.

So, the PV diagram looks like this:

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