Answer: D) My little sister passed first grade. She's the smartest kid ever.
Step-by-step explanation: A hyperbole is a type of figurative language that consists in exaggerating an event or a statement. From the given options, the phrase that represents an example of a hyperbole is the corresponding to option D: My little sister passed first grade. She's the smartest kid ever, because the speaker's sister isn't actually the smartest kid ever, it is an exaggeration that shows how proud the speaker is.