What must you do when entering an intersection?

Answer: B — Stop and check for traffic

When entering an intersection, it is important to first come to a complete stop and then check for any oncoming traffic. Accelerating would be incorrect as it could lead to a collision with other vehicles in the intersection. Changing lanes is also incorrect as it would not be necessary when entering an intersection. Coming to a complete stop without checking for traffic (option A) could also be dangerous, as other vehicles may not have enough time to stop and may collide with your vehicle. Therefore, the best and safest option is to stop and check for traffic before entering an intersection.