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: Two bikers are riding their motor bikes through rough terrain. they <sep> (A) cross a small red circle on a foreign land that has nothing in common. (B) are dressed in biking gear with protective helmets and clothing. (C) ride past ornate buildings. (D) pass by a sign for a ski resort.
Output:
B