The use of hydraulic brakes in automatic vehicles is a direct application of Pascal’s law; option [A]. Pascal’s law states that pressure applied to a confined fluid is transmitted undiminished throughout the fluid, enabling the effective operation of hydraulic systems like brake mechanisms. It ensures consistent brake performance by transmitting force from the brake pedal through the hydraulic fluid, resulting in the application of pressure on the brake pads or shoes, thereby facilitating vehicle deceleration. Torricelli’s law relates to fluid dynamics and the flow of liquids through an orifice, Archimedes’ principle concerns buoyancy and the upward force exerted on a submerged or partially submerged object, and Newton’s laws of motion pertain to the behavior of objects in motion and the forces acting upon them. However, it is Pascal’s law that directly governs the functioning of hydraulic brakes, demonstrating its practical significance in automotive engineering.