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".

Ex Input:
A girl flips and takes her turn then flips out of the center. A teen does a flip to the other side of the room. one of the teachers <sep> (A) comes and takes their places. (B) takes her turn next. (C) reaches down to help the girl who was standing up. (D) moves to the middle of the floor.

Ex Output:
D

Ex Input:
A man shows how to change a tube in a tire. he <sep> (A) puts a jack under the tube to lift it up. (B) puts a new tire on the tube. (C) takes the old tube out, puts the new one in, then pumps it up. (D) moves dirt covering the tube.

Ex Output:
C

Ex Input:
[header] How to prevent flip flops from hurting your feet [title] Wear them for short activities. [step] You can wear your flip flops for quick trips to the store, or to pick up your mail, and if you're meeting friends for a meal. As long as you won't be on your feet for a long time or doing something that risks injury, wearing flip flops is fine. <sep> (A) [title] Train your feet where you can slip, so that you don't end up with your wrist hurting. [step] Most people would assume someone else's wrist will be sore for an extended period of time. (B) [substeps] If you can hold them while leaving, try holding them while you're going to the store, too. Also, you can wear the flip flops while holding a book. (C) [title] Wear them to the beach or the pool. [step] Flip flops were really designed as a convenient and easy-to-wear shoe that you can take to the beach or the pool. (D) You just have to sit in them long enough to be comfortable. [title] Don't hesitate to take them off.

Ex Output:
C