Instructions: 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".
Input: They then start to pour some vinegar down the sink. They watch it all go down the drain and then pour in some more vinegar. then they <sep> (A) add some cream to the sink to clean it up. (B) add some salt and pasta to the sink. (C) start to add in more baking soda. (D) grab some baby powder and clean the sink.
Output:
C