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".

There are some people snow tubing on a slope covered with snow. two young children <sep> (A) are being snow tubing down a steep hill. (B) come down the slope in red and black tubes. (C) are snowboarding down a hill riding their snow tubing tubes. (D) are talking on the hood of a car or van.
B