Definition: 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: Walking down the street holding onto a skate board the boy puts his board down and begins to skate. Then three friends join him and they skate down the road. while <sep> (A) doing this, the boy putting his boards down is pushed by another friend and he walks up to where his board is. (B) laughing in the car each person uses their various tricks as they watch movies. (C) they all continue the boy in the middle is walking and watching all of them skate. (D) on the board they bend down with their hands behind their backs to build up some more momentum.
Output:
D