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”?

i think its d, but grammarly says none

explanation:

the word inculcate, with the meaning of trying to inluence someone to accept some idea or the act of repeating a statement in order to fix it in someones´s mind is a verb dated from the 1540s. its origin is from the latin inculcatus and formed with in + calcare, which means "to press in; to tread"

the goal is to iculcate in the students a tolerance for people of other religions iand races.

option d. is the correct answer