Answer: simile
Step-by-step explanation:
My sister was as quick as a whip during the game.
A simile is when two things are compared using like or as. In this case, your sister is compared to the speed of a whip using the word "as" - this means this is a simile.
Well, then what is a metaphor? Put simply, a metaphor is when you say one thing is another. "This pillow is a cloud" or "your cheeks are pink roses."