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Question:

You are driving on an undivided road. A school bus with flashing red lights is stopped ahead. What must you do?

A Stop, no matter which direction you are traveling in.
Explaination

In North Dakota, if a school bus has stopped with its red lights flashing, vehicles traveling in either direction must stop. They must remain stopped until either 1) the bus starts moving; 2) the bus driver signals to let vehicles pass; or 3) the red lights are no longer flashing. [Right of Way, Rules of the Road, North Dakota Noncommercial Drivers License Manual]