Q: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 
A girl stands at a kitchen sink and demonstrates rinsing her mouth out with crest whitening mouthwash. a girl <sep> (A) stands on a ladder in a kitchen and explains the mechanics of how to clean your mouth in an establishment. (B) is rinsing the mouthwash out of a small sink with water from a dispenser in the sink. (C) shows how to wrap a mouthwash around her mouth in small holes, twisting and bumping the sides of the mouthwash. (D) stands by a sink talking and using had gestures.
A:
D