In Each Cycle an Engine Gets 50

In each cycle an engine gets 50. J from the combustion of fuel and it expels 45. J of heat to the environment at 13.°C. What is the minimum possible temperature at which the 50. J could be taken in?

A) 33°C
B) 45°C
C) 23°C
D) 27°C
E) 20°C