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". 

Example Input: [header] How to elevate your hand while sleeping [title] Sleep on your back or side. [step] In order to elevate your hand while you're sleeping, you'll need to sleep on your back or on the side opposite of the arm that needs elevation. This is the easiest resting position for elevating your hand. <sep> (A) [substeps] Lying on your side not only has been shown to help alleviate hand inflation, but it also improves circulation in and around the hand and wrist joints. It's also more efficient than sleeping on your side. (B) [substeps] You can use a pillow to support your arm when you start to feel like your hand's elevating off the ground. Place a rolled up towel over your head to help prevent air from pooling near your arm. (C) [substeps] Sleeping on your stomach won't allow you to elevate your hand as easily. It's much harder to prop it up from behind if you're lying flat on your stomach. (D) [substeps] Lie on your back with the pillow propping your head up at a 45 degree angle. Your dominant hand should support the bottom of your pillow.
Example Output: C

Example Input: A man holds a pair of boots while talking and showing dirty parts. then <sep> (A) , he ankle many large tiny cuts of wood on the floor. (B) , the man replaces some parts by cutting the shoes and cleanser. (C) , the man puts paste on the boots, then he puts the shoes on. (D) , the man put a clothe inside the boot and brush the shaft of the boot thoroughly.
Example Output: D

Example Input: An underside of a canoe and paddle is shown. a man <sep> (A) is then seen running down the sand and jumping into a river with the object. (B) lathers water onto canoes, then places a wet cloth over the bottoms. (C) is in the water holding a fish, talking before he finally spits out the fish. (D) is paddling the canoe down a river.
Example Output:
D