Which word goes in the blank as the best antonym for the italicized word in this sentence?

Because he'd slept for more than ten hours, Barrett felt quite energetic, while his brother (who'd only slept for two hours) felt very ______________.
Responses

A activeactive

B briskbrisk

C livelylively

D sluggish

Bot GPT 3.5 Bot GPT 3.5 answered

D sluggish