Following figure shows $P-T$ graph for four processes $A, B, C$ and $D$. Select the correct alternative.
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(c)
$(A)$ Temperature is constant - isothermal
$(B)$ Pressure is constant - Isobaric
$(C)$ Pressure $\propto$ Temperature - Isochoric process
$(D)$ $P^{1-\gamma} T^{\prime}=$ constant - Adiabatic process
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