Which word or phrase provides the strongest context clue?

“Looking at that treasure”
“filled me with”
“richer than anyone in the kingdom”
“everyone would pay attention to me”

“richer than anyone in the kingdom”

The word or phrase that provides the strongest context clue is "richer than anyone in the kingdom." This phrase suggests that the speaker desires wealth and believes that having more money than anyone else in the kingdom would be significant.