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: Consider Input: People are standing in a swimming pool. they <sep> (A) are playing a game of water polo. (B) put on protective caps to ward off the cold. (C) dip a sponge into the water. (D) push themselves through a hole in the water.

Output: A


Input: Consider Input: [header] How to paint masonry walls [title] Remove any flaked or peeling paint from the masonry. [step] If the wall has already been painted, you need to remove any old paint that is loose, peeling, or flaking away. On an exterior wall, this is most efficiently done with a sandblaster. <sep> (A) New paint must be removed from the wall first, gently scraping around the edges with a rat-tail tail reciprocating scraper. This is most often done on exterior paint walls that are still meant to protect it from debris. (B) In areas where a sandblaster would be too messy and cumbersome, loose paint can be removed with a stiff wire brush and a paint scraper. [substeps] Failing to remove loose and peeling paint can result in the paint flakes mixing in with your fresh coat of paint and marring the finish. (C) [substeps] Make sure to turn off the water. Do not flush the wall down the drain. (D) If there is a paint-resistant paint strip still clinging to the wall, it may be painted to the wall as well, but not directly under it. [substeps] Using a sandblaster may be wise, but if the paint is not taking off, it may be better to start by sanding lightly.

Output: B


Input: Consider Input: [header] How to inject ovidrel [title] Get a prescription from a fertility specialist. [step] If you think you need a prescription for ovidrel, make sure you discuss this with a fertility specialist first. They may need to run some tests to confirm that this is a necessary next step for your path to conception. <sep> (A) They'll also offer you advice on how to apply ovidrel directly. [substeps] About 60% of women start using ovidrel a day after birth. (B) Expect reputable testing companies to run low-cost testing to prevent accidental overuse. Pay attention to any potential potential risks factors for having stds, including having irregular periods or vaginal bleeding. (C) When you give the product to your child, discuss any questions you have about possible side effects for your newborn. These questions may influence you whether or not ovidrel will treat cancerous cells on your baby. (D) [substeps] With the supervision of your fertility specialist and a proper prescription, you can begin your ovidrel treatments. [title] Get training from your doctor about how to perform the injection.


Output: D