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". 

[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

[header] How to make marijuana tea [title] Grind the marijuana buds. [step] Separate out the stems and seeds if necessary, and use a grinder or chop up the buds with a sharp knife until they're finely chopped, but not completely powdered. [title] Mix the buds with butter. <sep> (A) [step] Place them together in a bowl and use a spoon to mix up the buds and butter, making sure each piece is coated with fat. You want the grounds to be completely coated, but not soaked in butter; too much will inhibit the release of thc. (B) [step] Combine two tablespoons (59.6 ml) of butter with 1 teaspoon (4 g) of ground black pepper. Spread this mixture over the marijuana buds, and let it sit for several minutes. (C) [step] Pour the liquid ingredients from the grinder into a blender or food processor, then pulse the contents until well mixed. [title] Punch holes in the buds with a fork. (D) [step] Pour the softened butter into the potting mix. Press the buds down with your finger to blend them together without flaking off.
A

[header] How to use old coffee grounds around the house [title] Remove the used coffee filter from the coffee pot. [step] Empty the coffee grounds onto a paper towel. [title] Spread the coffee grounds around the paper towel. <sep> (A) [step] Gently press down on the filter, gently prying it out of the coffee grounds. The coffee grounds should be loose enough to allow you to clean them, but not so loose that you get a nasty water splatter in the interim. (B) [step] Hold onto the paper towel in one hand. With your other hand, hold the coffee pot in a horizontal position to help the coffee grounds disperse. (C) [step] Make sure the newspaper is around the filter. [title] Put a funnel in the coffee filter. (D) [step] Allow them to dry for twenty-four hours. [title] Decide what you'd like to do with the coffee grounds.

D