Given the task definition and input, reply with output. 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".

An introduction comes onto the screen for a video about how to clean a butcher block. a woman <sep> (A) then comes to show how to quickly clean a knife using a colander. (B) is shown banging down a block with a mallet while chopping it with a hammer. (C) comes onto the screen and begin to explain the process. (D) is seen mixing ingredients in a bowl and mixing sauce.
C