Final answer:
The sentence that correctly uses an antonym of arduous is: The homework assignment was pretty easy and didn't take much time to complete.
Step-by-step explanation:
The sentence that correctly uses an antonym of arduous is:
The homework assignment was pretty easy and didn't take much time to complete.
The word 'arduous' means difficult, demanding, or laborious. An antonym of arduous would be something that is easy, uncomplicated, or effortless. In the given sentence, the homework assignment is described as pretty easy and not time-consuming, which is the opposite of arduous.
Other antonyms of arduous include simple, manageable, smooth, and straightforward.
Learn more about Antonyms of arduous