The example of a metaphor from the options provided is:
That Jimmy Valentine is a diamond in the rough.
A metaphor is a figure of speech that directly refers to one thing by mentioning another, implying a similarity without using "like" or "as." In this case, Jimmy Valentine is being compared to a diamond in the rough, suggesting he has hidden qualities or potential.
The other options contain similes or personification but do not fit the definition of a metaphor.