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".
Input: [header] How to detect water leaks in walls [title] Look for standing puddles of water near a wall. [step] This is the simplest way to tell that you have a water leak in your walls. You can be sure that water is leaking in a wall if you see conspicuously wet carpet or notice that the floor is always wet in a certain area of your home. <sep> (A) [substeps] You're most likely to see wet flooring near major appliances that use water (washing machine, dishwasher) or in the bathroom near the sink, toilet, or shower. [title] Look for discoloration on a wall. (B) Water from a puddle near your residence or other public area may not be safe for rainwater to enter, and in any confined area can be dangerous. [substeps] Check up on leaks periodically to see how these things are affected. (C) [substeps] Your dry carpeting can usually tell you if you have a water leak here because it's not visible. If it only leaks into one area and there's not water and it isn't leaking through the wall, it will be visible. (D) [substeps] If your home is cluttered during the day, check your bathroom's plumbing and your insulation. This will tell you if water is leaking in these areas.
Output:
A