Read the sentence.
When the boy learned that his essay won first place, he was over the moon.

What is most likely the reason that the author included the clause “that his essay won first place”?

to compare his essay to the moon
to add personification to “his essay”
to exaggerate the importance of the boy
to provide a context clue for “over the moon”

the answer is "to provide a context clue for “over the moon”