Four curves represent the relation between pressure P and volume V of an ideal gas. One of the curve represents isothermal expansion and another represents adiabatic expansion. Which curve is representing adiabatic expansion?

 Four curves represent the relation between pressure P and volume V of an ideal gas. One of the curve represents isothermal expansion and another represents adiabatic expansion. Which curve is representing adiabatic expansion?

	Curve AB
	Curve AD
	Curve AC
	Curve AE