This question relates to Newton`s First Law of Motion, which states that an object will remain at rest or continue in uniform motion unless acted upon by an external force.

Option 1 suggests that the net force is a driving force in the direction of the car`s motion. However, this is not the entirety of the net force, the friction or the air resistance working against it should also be considered.

Option 2 believes the resistance force is the net force, but it only counters part of the driving force and cannot form the net force independently.

Option 3 states an inclined force, which isn`t related to the situation described; if the car is moving at a steady speed on a flat surface, there is no incline factor involved.

Option 4, our correct answer, claims the net resultant force is zero. This aligns with Newton`s first law as the car is not accelerating nor decelerating, but maintaining a uniform speed. It implies that the driving force propelling the car forward equals the opposing force (like air resistance and friction), thus the net force is zero.