The statement describes Newton’s first law of motion, also known as the law of inertia. It states that an object will remain at rest or continue moving in a straight line at a constant velocity unless acted upon by an external force. This principle highlights the concept of inertia, where objects resist changes in their state of motion. Newton’s second law of motion, on the other hand, describes the relationship between force, mass, and acceleration. Newton’s third law of motion deals with action and reaction pairs, stating that for every action, there is an equal and opposite reaction. Galileo’s law of motion is not a recognized scientific term. Therefore, the correct answer is [A] Newton’s first law of motion, which succinctly captures the concept of inertia in the absence of external forces.