You must obey instructions from school crossing guards:

• A. Only during school hours
• B. Only when children are present
• C. When the driver wants
• D. At all times

Answer: (D)

The main idea is that school crossing guards have the authority to control traffic to protect children, and drivers must follow their directions whenever they are directing traffic. You must obey their instructions at all times, even if it isn’t during typical school hours or if you don’t see children at that moment. They may be on duty before or after school or during events, and their signals and directions take precedence to ensure safety. The other options suggest limits or personal choice, which don’t apply because a crossing guard’s instructions are binding whenever they are directing traffic.