One mole of a monatomic ideal gas undergoes a cyclic process as...

$( A )$ Process- $I$ is not isochoric, V is decreasing
$( B )$ Process- $II$ is isothermal expansion
$∆ U = 0, W > 0$
$∆ Q > 0$
$( C )$ Process- $IV$ is isothermal compression
$∆ U = 0, W < 0$
$∆ Q < 0$
$( D )$ Process- $IandIII$ are NOT isobaric because in isobaric process $T ∝ V$ hence isobaric $T – V$ graph will be linear