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 person ski on a hill wearing dark winter clothes. the person <sep> (A) skis in the snow to open the chute to air the ski. (B) ski on the snow, but only the feet and sometimes the face is show. (C) lines up the ski slide rails on his ski. (D) skiski on the country slope while covered with snow in high altitude, and quickly passes above the pine trees, then the person continue on the mountain covered with snow.
B