Task: Text Completion
Input (English): There's a person walking on stilts on a sidewalk where several cars are parked. He is demonstrating how to walk on stilts. he <sep> (A) is using a walking stick to move back and forth on the sidewalk near a curb and railings. (B) is joined by two other men who also join him in the tutorial. (C) stops and takes a break. (D) demonstrates the trick using a real stilt.
Output (English): B