When a school bus is stopped with flashers on and its stop arm is extended, you must:

Answer: A — Stop before proceeding

If a school bus is stopped with its flashers on and stop arm is extended, it means that students are either getting on or off the bus. It is important to always come to a complete stop before proceeding, regardless of which direction you are traveling in. Option B is incorrect because attempting to pass quickly can put students at risk. Option C is incorrect because adjusting your speed does not guarantee the safety of students getting on or off the bus. Option D is incorrect because ignoring the bus stop arm is both illegal and dangerous. Always stop before proceeding to ensure the safety of students and follow traffic laws.