I honestly hope that this helps you.
<span>Speculation the others don't fit.</span>
I personally would say c) irony.
Why?
Alliteration is like the sally seashells kids song.
Metaphor is saying " he is a rock" when "he" is not actually a rock
Hyperbole is something exaggerated or a claim.
That makes me believe it is irony. Hope this helps.
Answer:
I don't think there is an error.
If there is, it's the 3rd option.
