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(C) In the given $T-V$ diagram:Process $I$: $V$ is changing,so it is not isochoric. Statement $(A)$ is false.Process $II$: This is an isothermal expan

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$B, C, D$

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(C) In the given $T-V$ diagram:Process $I$: $V$ is changing,so it is not isochoric. Statement $(A)$ is false.Process $II$: This is an isothermal expansion ($T$ is constant,$V$ increases). Since $W > 0$ and $\Delta U = 0$,the gas absorbs heat $(\Delta Q = W > 0)$. Statement $(B)$ is true.Process $III$: This is an isothermal compression ($T$ is constant,$V$ decreases). Since $W Process $IV$: This is an isobaric compression ($T$ is constant,$V$ decreases). Wait,looking at the graph,$IV$ is a horizontal line at constant $T$,which is isothermal. Let's re-evaluate: Process $I$ and $III$ are curves,not linear,so they are not isobaric. Statement $(D)$ is true.Therefore,statements $(B), (C),$ and $(D)$ are true.

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