Final answer:
The correct option is b. The car that turns to the left after initially traveling north is exhibiting circular motion, as its path curves and it moves at a constant speed under the influence of a centripetal force.
Step-by-step explanation:
When a car initially travels north and then turns to the left, it is changing its direction of motion. According to physics, and specifically Newton's laws of motion, if the car is moving along a circular path at a constant speed, it is experiencing an external force that keeps it in that circular path.
This external force is known as the centripetal force, and the motion this car is undergoing would be classified as circular motion. Therefore, the type of motion the car is experiencing is circular motion.