Mia wants to write an essay about the different pieces of equipment needed for horseback riding. Which detail would best support Mia's purpose? A. It can cost over $100 a month to keep a horse, but some stable owners will offer a reduced rate if you are willing to help out around the barn. B. The most crucial safety tip a rider must always follow is wearing a properly fitted helmet. C. Reins are leather straps that attach the horse's mouth to the rider's hands to help guide the horse. D. My first horse, Ella, was an American quarter horse with brown hair and a black mane.