Instructions: 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".
Input: [header] How to stop a horse rearing [title] Figure out the reasons for rearing. [step] A horse will rear for numerous reasons, but for the most part this can be linked to fear. A horse will rarely show its underbelly, the main situation they would do this in the wild is when stallions fight for a mate. <sep> (A) He may use his tail to shoo another horse to become the dominant one. This often occurs when the horse is ready or he needs to be ridden out, for example, for the exercise he needs to eliminate obstacles. (B) [title] Do not (poorly understand) halter your horse. [step] Use an upright bridle or halter. (C) In general kicking out and bucking is more common, and when young horses are backed, this is the natural reaction. If a horse is rearing there may be a serious reason, maybe it was taught to by previous mishandling or poor riding, for example. (D) Equestrian horses are often angry when their hooves strike the ground. In a much more mature show horse, this can be a cause for concern.
Output:
C