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 produce saliva [title] Chew gum. [step] One of the quickest and easiest ways to produce more saliva is to pop a stick of gum in your mouth and chew it. The chewing action tells your body that you are eating and that you need saliva to process your food. <sep> (A) For example, if you eat a potato or a peanut, you would suck on your gum slowly while chewing. Having the food on your tongue stimulates saliva production. (B) It is part of forming saliva and is easier to find throughout the day. [substeps] Chewing gum is also known as " saliva dyeing " in the united states. (C) [substeps] Do not chew gum when you are preparing a meal or training your dog. You could cause serious harm to your dog's health. (D) [substeps] It's a good idea to chew sugar-free gum if you have a problem producing saliva. The health of your teeth is already at risk from not having enough saliva, so introducing a bunch of sugar into your mouth potentially adds to the problem.
D