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". 

[Q]: [header] How to make silver nitrate [title] Wear proper protective equipment. [step] The chemicals necessary for this process are highly toxic and can lead to injury if not handled properly. Eye protection, gloves, and a lab coat are necessary to remain safe. <sep> (A) You should also wear long, loose sleeves or long pants to protect yourself from these hazardous chemicals. Be sure you wear good quality work clothes. (B) Long pants and closed-toe shoes, preferably without mesh, should be worn to protect against floor spills. [substeps] Eye protection should completely cover your eyes and the sides of your eyes to protect from splashes. (C) Your lab coat can protect your skin and prevent pollution while working. Ask your local hazardous waste management company to provide you with an appropriate safety gear. (D) Wear full, protective safety gear as well to get the job done effectively. [title] Choose a location for your lab lab.
[A]: B


[Q]: The men bend for the dogs to jumps on the back and throws the frisbee far and the dogs bring the frisbees. The dog jumps on the back of a man to catch the frisbee. also <sep> (A) , they throws the frisbee above we mat, the dog jumps again, throws the frisbee and the men collide and the dog jumps on the man to catch the frisbee and toss it. (B) the dog lifts the lawnmower and throws it off into the distance. (C) , a man does a flip and lands on the back of a man, the dog foals everywhere. (D) , men throw the frisbees far and the dogs catch them in the air.
[A]: D


[Q]: [header] How to do a seated figure four [title] Sit properly. [step] To do any seated yoga variation, you must be sitting in a solid, stable chair that allows you to place both of your feet firmly on the floor. Chairs with wheels or with a lot of cushioning in the seat typically aren't the best choices. <sep> (A) [substeps] Sit forward on the edge of your chair and make sure your back is neutral, not arched. You should be sitting on your " sit bones "-two points you'll be able to feel on your buttocks-not on your tailbone. (B) [substeps] Sit with both feet flat on the floor. If your chair's wheels don't provide enough cushioning, your feet are likely to feel awkward. (C) [substeps] The squat position is generally preferred for beginners. To get a deeper understanding of the pose, instead of trying to open your thighs with your toes, tilt your hips forward, keeping your toes off the floor and just gliding your palms over the chair legs. (D) [substeps] If you do sit on the floor, make sure to lay your back flat on the floor. Otherwise, the weight of your hips will strain or buckle the chair.
[A]:
A