What might a technician check to troubleshoot a school bus that is not starting?

Answer: C — The battery, connections, and fuel supply

To troubleshoot a school bus that is not starting, it is essential for a technician to check the battery, connections, and fuel supply. The reasoning behind this is that starting issues often stem from problems with these key components. The battery provides the necessary electrical power to start the engine; if it is dead or not functioning properly, the bus will not start. Connections are equally important because corroded or loose battery terminals can prevent the flow of electricity. Lastly, a sufficient fuel supply is crucial for the engine to start running; if the bus is out of fuel or there is a blockage in the fuel line, it won't start regardless of the condition of the battery or connections. In contrast, checking the fuel gauge might only reveal if there's fuel in the tank rather than direct troubleshooting of starting issues. Evaluating the radio system would not contribute to resolving engine start problems. Similarly, inspecting the windshield wipers is unrelated to the engine starting process. Therefore, focusing on the battery, connections, and fuel supply directly addresses the critical elements that affect the bus's ability to start.