According to the text book, why was the use of fuel load and fire load no longer an acceptable method to quantify a fire hazard? A. It is too difficult to accurately quantify the total energy in a fuel load B. It is important to understand not just the overall quantity of energy of a fire, but the time in which the energy is being released C. With the evolution to petroleum based fuels such as polyurethane and plastics, the comparison with natural fuels such as wood and cotton becomes too difficult D. Fuel loads and fire loads vary too much even in similar occupanciesn the following picture, which heat transfer medium is mostly at work keeping this balloon in the air? Hot air balloon flying in blue sky. A. Convection B. Conduction C. Radiation