Final answer:
The dragon would most likely attack the kingdom's people after an intruder took a gem-studded goblet from its treasure hoard.
Step-by-step explanation:
After an intruder took a gem-studded goblet from the dragon's treasure hoard, the most likely outcome would be that the dragon attacked the kingdom's people. In many stories and folklore, dragons are depicted as fierce and protective of their hoard, reacting aggressively to anyone who tries to steal from them. Therefore, it is reasonable to assume that the dragon would respond by attacking the kingdom's people in order to protect its treasure.