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 replace a flush valve [title] Shut off the water to the toilet. [step] Before beginning any installation, shut off the water source leading to your toilet or the toilet will flood the bathroom. [substeps] The valve is usually located on the pipes running into your toilet from the wall. <sep> (A) You won't be able to access this valve through the attached pipe as it may be clogged. This may cause your toilet to fill up more than usual due to more water. (B) Shut off the water by turning the valve clockwise until you feel resistance. [title] Remove any remaining water from the toilet. (C) To shut the water off, gently press down on the valve to stop the water from flowing out. The water may drain out from the toilet in a few seconds. (D) On the wall above the toilet you may also see an inner cylinder to allow your water to drain into the sink. [title] Once all running water is drained, shut your toilet's drain valve.
B