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 clean sperrys [title] Remove caked-on dirt with a bristle brush. [step] Using a soft toothbrush or a bristle brush made for leather, gently brush away any dirt, dust, or debris. Brush the leather with soft strokes in the same direction. <sep> (A) [substeps] Brushing the pricier areas first helps to allow for better handling of all surfaces. [title] Dust the back and sides of the flaked-off parts with a lint-free cloth. (B) If you scrub the shoes in multiple directions, you're likely to leave scars. [substeps] Use a rubber-bristled brush rather than a nylon-bristled brush. (C) [substeps] When applying pressure, make sure to keep the bristles away from your sperrys' feathers. It helps to remove any stuck on insects. (D) [substeps] Sweep or wipe off any grime stuck to the surface. Dry the area with a soft cloth or a clean towel afterwards.

A: B
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Q: [header] How to study the phenomenon of light as a nonequilbirum state of matter [title] Understand how thermodynamic systems are categorized. [step] Thermodynamic systems in nature are divided into two types. One is systems that are at equilibrium state with the environment and the other is systems that are in a state of nonequilibrium with the surroundings. <sep> (A) On earth, nature has a preference for systems that are at an equilibrium state with the surrounding. This is so due to the principle of minimum energy that every object in the universe aspires to have. (B) For example, gas rising in temperature throughout the day can be divided into microorganisms in the environment. [substeps] For example, gas rising in temperature in the atmosphere can be divided into molecules in the environment. (C) [substeps] Equilibrium is fundamental in thermodynamics. Other systems include stars, planets, and oceans. (D) [title] Learn about the term " rock hydrodynamics ". [step] Rock hydrodynamics refers to the transfer of water to the earth's surface.

A: A
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Q: [header] How to choose a suitable christmas gift for her [title] Determine the category to which the receiver belongs to. [step] She may be a family member, your friend or co-worker, your crush or just somebody you know. Every group of women has its category of gifts; however there is never a 100 percent conformity and compatibility. <sep> (A) [title] On christmas it is a tradition to buy different winter-related stuff that symbolizes appreciation, love and care. [step] Be original and remember that your gift shouldn't be necessarily tangible. (B) [substeps] If you decide you want a gift for her, it is important that it comply with tradition and this will vastly increase your quality of life. Break and tear up all the time that you can. (C) This is the category that you want to consider. [title] Have an open and honest conversation about different gift categories. (D) Compare these categories of gifts and figure out which one suits you most. [substeps] If she has a certain gift, consider offering her the free gift she would normally receive but which doesn't require her to give anything of value in return.

A:
A
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