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".

Clouds roll through several snowy mountains. Several people trek up it on skis. several skiers <sep> (A) use poles to cross a track. (B) then walk down a bumpy, snow covered slope. (C) get lost in the snow. (D) ski down the mountain.
D