Here's why:
* Personification gives human qualities to inanimate objects or abstract ideas. In this case, the tongue, a body part, is being attributed the human ability to "trick" someone.
Let's break down why the other options don't fit:
* Simile: A simile uses "like" or "as" to compare two things.
* Metaphor: A metaphor directly compares two things without using "like" or "as."
* Idiom: An idiom is a phrase with a figurative meaning that is different from the literal meaning of the words.
Since the sentence is giving the tongue a human quality, it's personification.