Given the task definition and input, reply with output. 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 relax your eyes [title] Close your eyes. [step] Do this sitting up to prevent yourself from falling asleep. Close them as tightly as you can to help your eyes relax. <sep> (A) [title] Breathe in deeply from your diaphragm. [step] As with any anxious activity, your breath is a key ingredient of relaxation. (B) It might be tempting to resist the urge to blink. Do not force your eyes to shut unless you really need to or do not want to. (C) [substeps] Hold this position for a few seconds, and then quickly open your eyes. Repeat it three to five times to help your eyes relax. (D) [title] Get up from the bed and move around a bit. [step] Try tensing and then relaxing your skin in different ways.
C