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 view is seen of the outside of an airport, then the wing of the flying plane. A man is on the plane wearing a mask. several people <sep> (A) are sleeping in the dark quarters. (B) fly by on a road inside the plane. (C) are shown flying the aircraft, while shooting at a large target at one point. (D) speak, then they all fly kites on the plane while people walk by.

Ex Output:
A

Ex Input:
[header] How to wear a sport coat [title] Learn the difference between a sport coat and other coats. [step] Though they're commonly conflated, a sport coat is not a blazer or a suit jacket. Sport coats need not match the fabric of the pants, as you'd find with a suit jacket. <sep> (A) The sport coat should also wear dark wash jeans and a tie. [substeps] Sports coats especially stick out in the summer and stay in place at night during the day. (B) Instead, they have a specific pattern or color used in place. Once you find a sport coat, stay in mind that it needs to be closely tailored. (C) In fact, many sport coats are used to cover up " casual " or something too formal, like a suit or slacks. Sport coats typically go below the knee or above. (D) The biggest difference between a sport coat and a blazer is that sport coats are patterned, while blazers are made of solid fabric with a contrasting color of button. [substeps] Stylistically, sport coats are sometimes a slightly looser fit than other kinds of dress coats, allowing for outdoorsy use and " sporting.

Ex Output:
D

Ex Input:
[header] How to throw a curveball [title] Grip the ball between your thumb and middle finger. [step] Place your middle finger along the bottom seam of the baseball and your thumb along the back seam. Leave your index finger off the ball. <sep> (A) Instead of using it to grip the ball, you'll be using it to point at where you want the ball to go. [substeps] Hold the baseball such that the curves of the seams are close to your palm, with one on top and one on the bottom of your palm. (B) [substeps] Try this trick by throwing a ball in two reverse positions. Place your thumb on the bottom seam, where it provides resistance while building up strength, then throw the ball upward. (C) [substeps] Also, keeping your index finger and thumb off the ball will reduce the chance of the ball being unbalanced and/or broken during the swing. [title] Position the ball on the stalk of the ball. (D) Place your index finger near the top of the ball on the opposite side of the seam. [substeps] The thumb should sit either about two to three inches down the seam.

Ex Output:
A