Given the task definition and input, reply with output. 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 protect pets from secondhand smoke [title] Quit smoking. [step] The easiest way to protect pets from secondhand smoke is to stop smoking yourself. If you smoke often, for instance in your home, and your pet is exposed to that smoke, then it can have very severe health consequences for both of you. <sep> (A) Instead, work on quitting smoking so that both you and your pet can have longer, healthier lives. [substeps] Quitting smoking can be very difficult. (B) Other professionals recommend quitting smoking altogether, since household members will be overwhelmed by all of the secondhand smoke particulate (smoke-related) pollutants in the room, which are more caustic than the indoor air. [substeps] For the best smoke protection, it's important to stop smoking altogether. (C) Your pet could die and inhale secondhand smoke. [substeps] If you smoke primarily in warm, breezy, climates, you may be able to quit just about anywhere, such as a metropolitan area or city. (D) [substeps] Quit smoking immediately if your pet has inhalation or throat burns due to secondhand smoke inhalation. Do not operate a gas stove or a fire engine if your pet has inhaled or swallowed any secondhand smoke.
A