The correct option is C heating, cooling, cooling, heating
By Boyle’s law at constant temperature, P∝1v
By Charle’s law at constant pressure, V∝T
Process taking place at
Constant temperature – isothermal
Constant pressure – isobaric
Constant volume – isochoric
Constant heat – adiabatic
K→LAt constant p, volume increasesthus, heatingL→MAt constant V, pressure decreasesthus, coolingM→NAt constant p, volume decreasesthus, coolingN→KAt constant V, pressure increasesthus, heating