Detailed 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".
Q: [header] How to prevent nearsightedness [title] Avoid reading in low light. [step] Reading in low light can force you to strain your eyes, which can lead to eye issues like nearsightedness. Make sure you only read books, magazines, and other printed items in bright, well-lit areas. <sep> (A) Reading in low light can encourage eye problems, such as blurring vision. It may also reduce or relieve blurred vision in children. (B) Avoid reading in overhead rooms where fluorescent lighting can damage your eyes. [substeps] If you can't tell the difference between artificially white light and fluorescent, a dim light may actually cause hyperfocus or blurry vision. (C) [substeps] If you are reading content on your cellphone, make sure the screen is bright so you do not have to strain your eyes. [title] Break up the time you spend looking at screens. (D) You should also avoid other nighttime sources of light, such as sunlight and headlights. If you are reading to raise awareness of the blurability of daylight coming through windows, go that route.
A:
C