The author wants to use overstatement in order to emphasize the speaker’s exhaustion. Which choice best accomplishes this goal?

I’ve been working on legal briefs all day. I’m so exhausted I could sleep for hours!

Choose 1 answer:
[A] NO CHANGE
[B] don't think I can sleep right now!
[C] won't be able to sleep for hours!
[D] could sleep for years!