The human body generates about 400 BTUs of body heat per hour while active. If an office that is 18 ft × 38 ft × 12 ft has 12 workers, how many BTUs per cubic foot do they produce in 5 hours? (to the nearest tenth)
A) 0.2 BTUs/ft3
B) 0.6 BTUs/ft3
C) 1.5 BTUs/ft3
D) 2.9 BTUs/ft3