The correct answer is C.) The person is sneaky.
Step-by-step explanation:
In texts or speech, it is common to use objects, animals, ideas, etc. to describe a different element, this occurs through the use of simile or metaphor that are two rhetorical figures that use comparison to describe a subject.
In the case of comparing a person as a weasel, the purpose of the author is not to state the person is a small mammal but to show the person has some feature weasels also do. According to this, it is likely the writer means "The person is sneaky" because weasels move sneakily and seem to be very furtive or sneaky and this is a feature people can also show.