Final answer:
The correct term for tampering with a horse's teeth to make it appear younger is floating. It involves filing down a horse's teeth but can be dishonestly used to deceive buyers about age. The correct answer is option: b) Floating.
Step-by-step explanation:
Tampering with a horse's teeth to alter the appearance of its age is known as floating. The question specifically asks what term is defined as tampering with cups on a horse's teeth to make the horse appear younger than it actually is. The correct answer to this question is b) Floating.
Floating is a veterinary practice that involves filing down the sharp edges of the horse's teeth, which can occur due to normal chewing. However, the term can be misused to describe a dishonest practice where individuals may alter the teeth to deceive a buyer about the horse's age, as young horses have well-defined cups in their teeth that fade as they age. It's important for buyers to be aware of such practices and to have a trusted veterinarian examine the horse's teeth before purchasing.