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]: [header] How to cook bay scallops [title] Have the rest of your meal, including the sauce, already cooked and ready to go. [step] Scallops taste the best the moment they are done cooking. If you cook the scallops first, and then the pasta, sauce, and so forth, they won't taste as good. <sep> (A) [title] Remove the side-muscles, if necessary. [step] It will feel like a tough spot on the side of the scallop, with the tissues running horizontally instead of vertically. (B) In addition, they'll become soggy when you're ready for the pasta, so it's best to bring them all out at once so they don't burn. [title] Read the instructions on the package of mascarpone. (C) [title] Pour the bay scallops onto a serving plate. [step] Reserve some room in your refrigerator for the traditional enchiladas served with scallops. (D) [substeps] [title] Slice your scallops in half. [step] Use a sharp knife to slice 1 scallop horizontally so that there is one open side.
[A]: A


[Q]: [header] How to add color to gum paste [title] Select this procedure when you need small amounts of several different colors. [step] Gum paste will begin to harden if exposed to air. Keep unused portions in a sealable bag or air-tight container to retain moisture. <sep> (A) The mask will have to be adapted to your mouth rather than your teeth. [title] Open your mouth and brush your teeth and gums (or tongue) with the gum paste. (B) [title] Work with a little bit at a time. [step] After you take it from the container, the gum paste may be stiff. (C) [title] Open one remaining piece of gum paste, then add your color. [step] By rolling the paste between your fingers, you can extract the color from the rim of the container. (D) [substeps] Gum paste that is exposed to air can potentially harden, retaining some of its bright color and making it harder to reveal new color. This process will also clear any potential stains or bacteria that were created along with the paste.
[A]:
B