This ques is from jam2021. this is much disputed ques, as many students challenged answerkey, but iisc did not changed it. please see.

Q.36 A Carnot engine operates between two temperatures, T = 100 K and Tu = 150 K. Each cycle of the engine lasts tor 0.5 seconds during which the power delivered is 500 J/second. Let Qn be the corresponding heat absorbed by the engine and QL be the heat lost. Identify the correct statement(S). (A) Ou = 750J (B)s (CThe change in entropy of the engine and the hot bath in a cycle is 5 J/K (D) The change in entropy of the engine in 0.5 seconds is zero