If you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in calories and joules)

For the answer to the question above, 
Q = amount of heat (kJ) 
cp = specific heat capacity (kJ/kg.K) = 4.187 kJ/kgK 
m = mass (kg) 
dT = temperature difference between hot and cold side (K). Note: dt in °C = dt in Kelvin 

Q = 100kg * (4.187 kJ/kgK) * 15 K 
Q = 6,280.5 KJ = 6,280,500 J = 1,501,075.5 cal

The CORRECT answer is actually

B.  

Chemical Energy Electrical Energy Heat Energy

Explanation:

There are chemicals inside a battery. They produce electrical energy (you can tell this because batteries have positively-charged and negatively-charged ends). Electrical energy is then transformed into heat energy so the igniter will work.