Which of the following is a sign of dehydration in clients?

Dry mouth and decreased urine output are significant indicators of dehydration in clients. When the body lacks adequate fluids, one of the first noticeable changes can be a dry mouth, as the saliva production diminishes due to insufficient hydration. Additionally, the kidneys prioritize conserving water, leading to reduced urine output. A decrease in urine not only signifies that the body is attempting to retain fluid but also may result in darker urine, which is often a sign that the urine is more concentrated.

The other options put forth, such as increased appetite, bright skin tone, and frequent urination, do not correlate with dehydration. Increased appetite is typically associated with proper hydration and health, bright skin tone usually indicates good hydration, and frequent urination is more common in overhydration or certain medical conditions rather than dehydration.