Instructions: 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 do brain training [title] Learn something new. [step] Keep your brain stimulated and active by picking up a new habit. Practicing something new forms new neural pathways in your brain. <sep> (A) Repeating the same action over and over strengthens these newly formed brain pathways. The more you use your brain, the better it will work. (B) Mindfulness is a great introduction to new habits. Don't just rush to start learning, you can ultimately become a better learner by learning something new every day. (C) The more you learn something new the more ideas you will have. For example, learning the basics of a musical instrument builds a new passion for the instrument. (D) It's a new skill that both people who do brain training and their professions get used to. [substeps] Get out of the habit of following a strict routine, or instead try something new.
Output:
A