When a car moves on a straight road, its path is along a straight line. In such a case, the motion of the car is considered as rectilinear motion because the object (in this case, the car) moves along a straight line without changing its direction.
• Curvilinear motion refers to motion along a curved path, such as a car turning on a curved road.
• Periodic motion refers to motion that repeats at regular intervals, such as a swinging pendulum.
• Rotational motion involves the motion of an object around a fixed axis, such as a wheel rotating.
Conclusion:
The correct answer is: B) Rectilinear motion.