Answer:
С "Yankee ingenuity" allowed the United States to create many products to send
abroad for profit, thus stoking a burgeoning national economy.
Step-by-step explanation:
An epithet is a term that is used to describe a trait or attribute. It means "added" and when used in literary terms it is used to describe the character to the reader.
Therefore, the sentence from the passage that the author demonstrate the rhetorical use of an epithet is option C.
This is because the term "Yankee ingenuity" is an epithet that is used in rhetoric.