If you are involved in a collision and the damage is less than $2000, you must...?

Answer: C — Exchange details with the other party

If you are involved in a collision that causes damage less than $2000, the most important thing to do is to exchange details with the other party. This includes names, contact information, insurance information, and license plate numbers. This allows for proper documentation and helps to ensure that any necessary claims can be properly filed. The other options are incorrect because leaving the scene, waiting for the police, or reporting the collision at a police station are not necessary for minor collisions that result in less than $2000 worth of damage.