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 breed chihuahuas [title] Adopt a chihuahua to breed. [step] If you don't already have a chihuahua, you will need to get one that is ideal for breeding. Contact a breeder that specializes in breeding chihuahuas. <sep> (A) If you are looking to adopt a chihuahua you can breed, you should get it from a well-established and humane breeder that has solid documentation of its lineage. [substeps] Make sure your potential dog is in good physical and mental shape. (B) This is a good option for investors that want to go through a breed-specific final selection process before purchasing a dog from one of the breed-specific breeders. [substeps] Breed chihuahuas can learn complicated rules, including you will need to breed them yourself, or you may be able to substitute a dog from a previous relationship with one that is already bred. (C) Look around for a unique breed, preferably one that offers a wide variety of features. Remember to pay attention to age, as a young chihuahua is a rodent, and a healthy small baby chihuahua needs to be training and raised carefully. (D) Shop around a few different places before settling on one that is right for you. [substeps] Get a volunteer or mentor for this breed.
[A]: A

[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]: [header] How to be less emotional [title] Practice breathing techniques. [step] Breathing can help calm you down when you're experiencing overwhelming emotions such as rage, endless crying, or deep disappointment. If you're feeling overwhelmed by emotional intensity, pause to focus on your breathing. <sep> (A) Breathing techniques can help you manage your emotions more effectively and help you handle intense emotions better. You may notice that as you experience intense emotions, they bring you further from experiencing yourself and your body. (B) This will help you realize what's triggering your emotional outbursts and ensure you're not suppressing it. [substeps] When watching tv, sit in a quiet spot and take in a big, steady breath. (C) [substeps] When you're feeling rushed, slow down and focus on your breathing. The more frequently you do this, the harder it will be to remain calm and collected. (D) Take in a deep breath slowly to relax and calm you down. [substeps] Take a brief moment to breathe deeply before and during a conversation that impedes your flow of thoughts.
[A]:
A