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: [header] How to grip a fastball [title] Pick up baseball and place in throwing hand [title] Hold the ball with a proper throwing grip. [step] This means your index finger and middle finger are on top of the ball with your thumb pushing it against your folded ring finger and pinky for support. [title] Rotate the ball in your hand until you find the " horseshoe seam ". <sep> (A) [step] If this is your first time using a fastball, you should make sure you are holding it correctly. [substeps] The horseshoe seam is located at the bottom right corner of the ball. (B) [step] The horseshoe seam will be the seam that forms when the outfront of the ball is pushed against an extending baseside seam. This seam protects the seam making the fastball strike. (C) [step] This will essentially form a horseshoe shape. [title] Fold your wrist in the horseshoe curve to open it up for throwing. (D) [step] This is where the seams form a c shape, a backwards c shape, or a horseshoe shape. [title] Place the last one-third of your index and middle fingers across the top seam of the horseshoe seam.
Output:
D