An exercise class had 20 people. If each person produced 2,200 BTUs of body heat during the class and the room is 30 ft × 40 ft × 15 ft, how many BTUs per cubic foot did they produce? (to the nearest hundredth) A) 0.12 BTUs/ft3 B) 1.83 BTUs/ft3 C) 2.44 BTUs/ft3 D) 36.66 BTUs/ft3