Which object has the least thermal energy?

 - a 250-gram mug of cider at a temperature of 31°C
 - a 250-gram mug of cider at a temperature of 29°C
 - a 250-gram mug of cider at a temperature of 53°C
All three mugs of cider have the same mass but different temperatures. Since the 29°C mug of cider is the coldest, it has the least thermal energy.