A cyclic process $ABCA$ is shown in the $V-T $ diagram. Process on the $P-V$ diagram is
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(c) From the given $VT$ diagram,

In process $AB, \,V  \propto  T$ ==> Pressure is constant (As quantity of the gas remains same) 

In process $BC,\, V =$ Constant and 

in process $CA, \,T =$ constant 

$\therefore$ These processes are correctly represented on $PV$ diagram by graph $(c).$

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