You will be given a definition of a task first, then some input of the task.
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".

[header] How to retain information when you study for a test [title] Read actively. [step] You won't retain information if you just casually read the material. When you're re-reading for a test, or reading new information, do so actively. <sep> (A) This will help you remember the information better when a test arrives. [substeps] It's easy to read a whole page and realize you took in nothing. (B) Place your pen and notepad on a flat surface, and sit down with your attention on the text you're reading. The less time you use to study, the less effectively you'll retain information. (C) Actively looking for information is the best way to retain information. Once you've read several chapters with quick answer questions, it's normal for your mind to wander and get lost. (D) Pay attention to key paragraph breaks in the material, and clear your mind of all thoughts. The more active your mind or body is, the more likely you are to retain information.
Output:
A