Which of the following statements is true about inertia?

Inertia is a fundamental property of matter that describes an object's tendency to resist changes in its state of motion. The correct statement about inertia asserts that it causes an object to remain at rest unless acted upon by a force. This principle is rooted in Newton's First Law of Motion, which states that an object will not change its motion unless acted upon by a net external force. In simpler terms, an object at rest will stay at rest, and an object in motion will continue moving at a constant velocity in a straight line, unless a force causes it to change this state.

This concept is essential in understanding basic mechanics and motion, as it explains why objects do not spontaneously start moving or stop moving without an external influence. Other options presented do not accurately capture the essence of inertia, as they either misinterpret its role concerning motion, ignore its applicability in various contexts, or incorrectly relate it to the object's velocity.