The correct answer to your question is C.
"Your heart is ice" is an example of a metaphor. It's an example of a metaphor because it is referring to something being something, but it is not actually literal, for instance, lips cannot actually be ice.
Option A is a simile since it contains the word "like," option B is using personification because it is saying the fingers dance though that is something humans can do, and option D would be incorrect because it is also using a simile (it contains the word "like.")
I hope this helps! :)