A heat reservoir at 900 K is brought into contact with the ambient at 300 K for a short time. During this period 9000 kJ for a short time. During this period 9000 kJ of heat is lost by the heart reservoir. The total loss in availability due to this process is
(a) 18000 kJ (b) 9000 kJ
(c) 6000 kJ (d) None of above