Definition: 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 change a pool light [title] Shut off all power to the pool lighting. [substeps] This will be done at your electrical box. Some swimming pools have been equipped with their own breaker boxes. <sep> (A) [title] Clear the area of the pool that is near lights. [substeps] Remove any large rocks, fallen trees, or other debris from the pool, especially under the lights you will be installing on them. (B) [title] Check to make sure power is off by trying to turn on the pool lights. [substeps] Not sure about this step...if light is burned out, it will not turn on anyway. (C) [title] Rotate the pool lights right every 20-30 seconds. [step] If your pool goes dark, reset power to the same water circuit that you drained earlier and then turn your pool lights back on. (D) Most has a switch that shuts off only water when the wiring is up. If you are right footed, you will get most of your operation done from here.
Output:
B