A human body that is performing light work generates about 400 btus of the body heat per hour while active. if an office that is 20 ft x 30ft x 10ft has 8 workers, how many btus per cubic foot do they produce in 3 hours(to the nearest tenth) 
 A)0.2 BTUs/ft3
 B)0.6
 C)1.5
 D)2.9