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 recognize chickenpox [title] Watch for symptoms on the skin. [step] Approximately one or two days after developing a runny nose and sneezing, you may see red spots on your skin. These dots often start on the chest, face, and back, are often itchy, and can quickly spread to the rest of the body. <sep> (A) [substeps] When this occurs, it may also be due to a new virus. If you experience any major allergic reactions to chickenpox, such as hives or rashes, contact the doctor. (B) If you suspect that you may have chickenpox, you can easily detect these signs and get medical care. [substeps] These red itchy spots may be small, crisp, or feel tight when you press them onto your skin. (C) [substeps] If you are experiencing a runny nose, you may also develop a flu or fever the following day after taking chickenpox. Syphilis, the " natural flu, " often shows up early in the infection, and even greater in children. (D) [substeps] These red spots will turn into red bumps and then small blisters (vesicles). These spots contain the virus and are highly contagious.
D

There are people on personal sailboats and they're holding onto their sails, leaning as far back as they can. a woman wearing a hat, wetsuit and a lifejacket <sep> (A) is sitting in the water and she's holding fruit and reading a book on a tablet. (B) is standing in rear of the sail the boat is on. (C) is seated on the lifebuoy. (D) is sitting on her sailboat and holding onto her sail and steering.
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