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 tell when you are straining your eyes [title] Check for sore, tired, burning or itching eyes. [step] If your eyes start to itch, burn or get tired, this might be a symptom of eye strain. Keeping your eyes focused for long periods of time at the same distance can sometimes cause eye fatigue. <sep> (A) [title] Determine if you have eye strain while sleeping. [step] A sore eye might be caused by allergies to a variety of allergens. (B) [substeps] People with eye strain often have puffy eyes. [title] Check for allergies to irritants. (C) If this happens, take a break from what you're doing. A damp washcloth laid over the eyes may help relieve the discomfort. (D) Check for retinal and cancerous conditions such as horn inflammation, in which case you may need additional prescription eye drops. Common eye infections can be caused by bacteria, viruses, and other pathogens, though they are rarely very serious.
C