Newton's third law states that:

Newton's third law of motion articulates the principle that for every action, there is an equal and opposite reaction. This means that when one body exerts a force on another body, the second body exerts a force of equal magnitude but in the opposite direction back on the first body. This law is fundamental in understanding interactions between objects, as it explains how forces operate in pairs and ensures that momentum is conserved in isolated systems.

This principle is crucial in various applications, from simple interactions (like pushing off the ground when jumping) to complex ones (such as the propellant action of rockets). The emphasis on "equal" and "opposite" suggests a balanced relationship between the forces involved, highlighting the interconnected nature of physical interactions.

The other choices relate to different laws of motion. The first choice focuses on the concept of inertia (Newton's first law), while the second choice pertains to the relationship between force and acceleration (Newton's second law). Thus, the correct selection captures the essence of Newton's third law perfectly.