Final answer:
The property that refers to objects remaining at rest or moving in a straight line at constant velocity is called inertia, which is option A) Inertia. This concept is part of Newton's first law of motion and is directly related to an object's mass.
Step-by-step explanation:
A property of matter that refers to objects remaining in a state of rest or uniform straight-line motion is called inertia. The correct answer to your question is A) Inertia. According to Newton's first law of motion, often referred to as the law of inertia, every object will continue to be in a state of rest or move at a constant speed in a straight line unless acted upon by an outside force. This law indicates that an object will not change its motion unless a force is applied to it. Therefore, an object in linear motion with constant velocity or one that is at rest possesses inertia. The inertia of an object is measured by its mass, which is the quantity of matter the object contains.