Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to get in shape fast [title] Set an aerobic goal. [step] Getting in shape quickly is a vague goal. It mostly includes a desire to get in shape both aerobically and to build muscular strength. <sep> (A) To get your fitness up quickly, set an aerobic goal of getting up to the gym five to ten times a week. [substeps] Begin your workout on the treadmill. (B) According to the american academy of bodybuilding (ect), working out 150 minutes a week and 3 times a week for 7 to 10 years can help your body to grow. [substeps] Understand that many athletes are unable to complete a fitness level until their first years of training. (C) [substeps] Start by setting an aerobic or cardiovascular goal. Make sure to be specific and realistic with your goals. (D) However, it shouldn't be so vague or mentally daunting that you fail to even be fit enough to do it, no matter how close you are to becoming an athlete. [substeps] You should motivate yourself and focus on being physically fit with these goals and commit yourself to building muscular strength.
Student:
C