IF the engine receives 500 kJ from A and 400 kJ from B then what is the heat exchanged from thermal reservoir C?

Question

A reversible engine exchanges heat from three thermal reservoirs A,B and C at 100 K, 800 K and 200 K respectively. IF the engine receives 500 kJ from A and 400 kJ from B then what is the heat exchanged from thermal reservoir C?

         (a) 450 kJ rejected to thermal reservoir C

         (b) 350 kJ  rejected to thermal reservoir C

         (c) 250 kJ rejected to thermal reservoir C

         (d) 200kJ rejected to thermal reservoir C