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]: [header] How to avoid the stomach flu [title] Wash your hands often. [step] Wash your hands carefully with soap and water for at least 20 seconds. Always wash your hands after going to the washroom and before and after handling food and eating. <sep> (A) Washing your hands is important, since if the way you handle and eat is bad (germs, bacteria, etc. ), your best chance at preventing the flu is by keeping your hands clean. (B) Don't attempt to dry or clean your hands on something other than a business table. [title] Wear long pants (not utility pants to wear running shoes with). (C) [substeps] It's a good idea to wash your hands between-and as many times as you go to the bathroom. This will help prevent an episode of nausea in the future, as well as allow your body time to shut down its internal defenses to fight off food, germs, and viruses. (D) This will help to prevent the spread of germs. Germs on your hands can get into your eyes, ears, and nose and make you sick.
[EX A]: D

[EX Q]: [header] How to do chest exercises in yoga [title] Do the mountain pose to warm up, plus a couple of humming bee breathing exercises. [step] These will get you ready to stretch out your body in the variety of poses you'll use to exercise your chest. Notice your breathing pattern as complete the mountain pose. <sep> (A) Inhale and keep your breathing slow and even throughout the whole warm up period. [substeps] Alternatively, do a crossfit pose to warm up. (B) [substeps] You might try taking an extended pause to " use " your rib cage, start to breath in, breathe out, and repeat. You can also try practicing your opening pose from a hovering yoga chair, at home, or in a pose at your workplace. (C) Settle on a consistent, slow pattern of breath as you start the workout. This breathing pattern will help calm yourself and prepare your heart rate for the more difficult exercises to come. (D) [substeps] After doing the mountain pose, you can do finger circles or kangaroo standing pose to warm up the muscles in your chest. [title] Do the rock dii to strengthen the core.
[EX A]: C

[EX Q]: [header] How to choose a flight instructor [title] Airports usually have a fixed base operator (fbo). [step] Larger general aviation airports may have several to choose from. The fbo usually hosts (or may own) a flight school. <sep> (A) The average fbo average cost is one 8x10 square foot. Fbo centralized flight schools (cswr) include airports as well as beverage stores and warehouses, as well as private operations/equipment suppliers. (B) Flight schools have certified flight instructors (cfi's) and training aircraft for rent. [title] If no one has recommended a cfi, the school will assign one to you. (C) [title] A fbo is a group of pilot instructors who maintain a constant operation routine with at least one fbo so they can whisk passengers to and from different locations. [step] If needed, they would provide additional meal times for those who pilot, no matter how much training they may have done. (D) The fbo makes all of its decisions, especially those related to the schedule and planning. If you plan to rent a car, you may want to consider a trip to the u.s.
[EX A]:
B