The reason that your car remains stationary when parked is

The correct answer is "Friction of the tires on the road surface".

Friction is known as a force that resists relative motion of solid surfaces, which is sliding against one another, in this case the car's tires and the road, because of the friction present on the tires of the car, the car remains stationary, though it is parked on a steep hill.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

the telephone is the answer