What is a common use for service animals on a school bus?

Service animals are commonly used on school buses to assist children with mobility challenges. These animals, often trained specifically for support tasks, help individuals navigate their environment, providing not only physical assistance but also emotional support. For students with disabilities, having a service animal can enhance their ability to access education effectively, by offering companionship and aiding mobility both on the bus and at school.

The other options do not accurately describe the primary roles of service animals in the context of school transportation. Service animals are not responsible for providing transportation for staff, guarding vehicles, or directly managing school discipline, as these roles fall outside their intended purpose and training. Thus, the correct choice emphasizes the essential support that service animals provide to students with mobility difficulties, facilitating their independence and integration within the school environment.