Concept:Heat of combustion is the heat released when one mole of a substance burns completely in oxygen.Explanation:A bomb calorimeter is used because it measures this heat accurately under constant volume conditions.The substance is placed in a sealed steel container filled with oxygen and ignited electrically.The heat released raises the temperature of the surrounding water, and this temperature rise is used to calculate the heat of combustion.A thermometer only records temperature and cannot contain the combustion reaction.An evaporating dish and a boiling tube are not designed for controlled combustion measurements.Answer:B. a bomb calorimeter