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 work out longer [title] Set a goal. [step] Before you aim to increase the duration of your workout, you have to know what your end goal is and how you will get there. Set a goal that is: specific, measurable, attainable, realistic, and timely. <sep> (A) [substeps] For example, set a goal to add two extra minutes to your workout, five days a week. Once that's attained, you can revisit your goal and opt for five extra minutes five days a week. (B) Don't set an unrealistic goal, or else your body will feel like you're saying no to the goal. Setting an achievable goal doesn't have to be a big challenge, but the goal you set should be realistic and achievable. (C) Strive to lose five pounds per week so that you don't feel overly drained or stressed. [substeps] Your goal should be vague, time-stamped, and achievable; you don't want to write it down all over the desk just in case you catch up with it later in the day. (D) [substeps] Tell yourself that you will do a moderately intense workout with one set of exercises per week. Say that you will do at least three sets of three days a week, each time starting your workouts in the morning and moving back at lunch.
Student:
A