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".

[Q]: A indoor course is panned with camera in a warehouse setting. an athlete <sep> (A) runs on the course with a javelin, catching it about six times in the air before returning to throw again. (B) runs down a track and pole vaults over a high bar and onto a cushioned landing pad. (C) runs through the course exhibits. (D) performs a routine on the course taking long spins around turns.
[A]: B

[Q]: A man is preparing to run and jump. he <sep> (A) runs very quickly down the track. (B) is doing a stunt, then dismounts to the ground. (C) releases the bar, and lands a few feet away. (D) is blindfolded and jumps full speed into the sand.
[A]: A

[Q]: [header] How to understand the book you are reading [title] Keep reading to see if you can figure it out. [step] It's easy to get hung up on confusing parts of books. Read the paragraphs immediately before and after the passage that you don't understand. <sep> (A) Make sure you understand each word as well. [substeps] Try writing down each chapter as you go. (B) There is no point in doing this if you aren't sure what you are reading. [substeps] This way you can read in the middle of an assignment, a lecture, or any time at any given time throughout the day. (C) By watching the reading speed you can also be able to make a better view of the book. [substeps] Don't allow the text to distract you. (D) If you're still confused, read a few more pages forward. [substeps] Sometimes, putting confusing passages into the wider context of the book will help you reach a sudden " ah-ha! " moment.
[A]:
D