Which object has the least thermal energy?

 - a 7-kilogram block of copper at a temperature of 17°C
 - a 7-kilogram block of copper at a temperature of 19°C
 - a 7-kilogram block of copper at a temperature of 27°C
All three blocks of copper have the same mass but different temperatures. Since the 17°C block is the coldest, it has the least thermal energy.