D. Take a bellyflop in a pool, and you'll find that the water feels pretty hard.
Answer:
Metaphor
Explanation:
It is NOT a personification because nothing there has human characteristics.
It is NOT a simile because there is no like or as words.
It is NOT an alliteration because there is no repetition of consonant sounds.
Therefore it's a metaphor.
Hamlet killed Polonius believing him to be Claudius spying him.