Q: 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".
Family day at the beach, father and son are walking around and then they start to play in the sand. They have a sand in buckets trying to build sand castles. when they <sep> (A) are done, father sets up the basket and makes a child touch his face in front of it. (B) are done making their castles, they go to the field to shovel it into a big metal bowl to build a sand castle. (C) are done they check the money to see if they have enough for a new sand castle. (D) take the bucket up the sand isn't very stable at all.
A:
D