Which object has the most thermal energy?

 - a 5-kilogram bucket of water at a temperature of 66°F
 - a 5-kilogram bucket of water at a temperature of 84°F
 - a 5-kilogram bucket of water at a temperature of 78°F
All three buckets of water have the same mass but different temperatures. Since the 84°F bucket of water is the hottest, it has the most thermal energy.