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". 

[EX Q]: 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.
[EX A]: A

[EX Q]: [header] How to treat ingrown eyelids in dogs [title] Look for squinting. [step] Squinting is an easily recognized sign of eye irritation. Your dog may squint if it feels like there's something in the eye that it can't get out. <sep> (A) In this case, the ingrown eyelid is causing the eyelashes to rub directly against the eye. If you can't tell if your dog is squinting, compare the size of your dog's irritated eye to the other one. (B) This is not always an indication of eye irritation. It's often the case that tears will build up within the eyelids, which can cause the eyes to appear unfocused and dry. (C) It may also display its eyelids twitching or blinking repeatedly. Some dog owners find it embarrassing to have their dog squint because of its inability to see. (D) Visit your vet if you notice : [substeps] Squinting irritation blockage of the eye. This is the case with retinitis, which causes squinting.
[EX A]: A

[EX Q]: [header] How to become a perfusionist [title] Take high school classes in science and communication. [step] Take the most advanced chemistry and biology courses offered in your high school, as well as courses in composition and oral communications. [substeps] Maintaining a high gpa and participating in extracurricular activities can help you get into a good college. <sep> (A) [title] Attend a school that offers an undergrad degree in perfusion. [step] There are only 4 schools in the us that offer perfusion science programs. (B) Programs can be extremely rewarding, especially when you have goals that seem remote. [title] Find a local community college or community college or university. (C) Stay away from extracurricular activities in your teenage years, as they may make it harder for you to pass your ged test next year. [title] Sign up for seminars in subjects that interest you. (D) Getting a good college education, however, is much less significant than having a high gpa, since you must be fit and healthy for this position. [title] Access textbooks and websites to improve your skills.
[EX A]:
A