How must students be supervised when being discharged from the bus?

Answer: C — By an adult designated by a parent or school official

Students must be supervised by an adult designated by a parent or school official when being discharged from the bus to ensure their safety. This supervision is vital because it helps to manage the students as they exit the bus and cross the street or move towards designated areas. An adult can provide guidance, ensure that students wait until it's safe to cross, and help prevent accidents. The other options are not sufficient in ensuring safety. The bus driver alone might not be able to supervise all the students effectively as they focus on driving and ensuring the bus is secure. Having no supervision at all could lead to chaos, increasing the risk of accidents or injuries. Relying on a fellow student does not provide the accountability and responsibility necessary for safeguarding younger children, as they may not have the experience or maturity needed to manage such situations properly.