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 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

[Q]: A police officer is riding a horse down the street very slowly. many bystanders <sep> (A) cheer as he gets closer. (B) are walking by, cars are passing and casually moving along. (C) are standing up nearby. (D) join in to help him, and several other cars come along.
[A]: B

[Q]: [header] How to use an avocado for beauty care [title] Make a basic mask with honey and avocado. [step] This mask is great for dry skin, but it can also give your skin a healthy glow. Simply mash up the avocado until it is smooth and lump-free, then stir in the honey. <sep> (A) Mash the avocado as normal so that it forms a paste which can be removed after 20 minutes or more. [substeps] The honey may sting your skin and leave scars. (B) Massage the mask onto your face fo a few minutes. Leave it on for 15 to 20 minutes, then rinse it off with warm water and pat your face dry. (C) You can also put in some honey as well, but it'll be too heavy for use on dry skin. [substeps] Mash a avocado in your hand until you feel the consistency of salicylic acid. (D) Make a basic mask using 1 tablespoon of honey and 1 teaspoon of coconut oil. [title] Find two bananas and grate the bananas together.
[A]:
B