Task: Text Completion
Input (English): And introduction comes onto the screen for a video about how to remove a bike chain. a person sitting next to a bike <sep> (A) runs his hands around the chain on it. (B) is assembling a handle. (C) is about to look at the chain from which it was removed, and he starts swinging his legs around in circles. (D) demonstrates how to remove and replace a bike chain using a small tool.
Output (English): D