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.
A conclusion reached on the basis of evidence and reasoning.
It is saying to give the definition of the word ambiguous, if that didnt help then you need to ask more clearer.
