Which of the following is the cause of an acceleration or a change in an object's motion?

Net force causes an acceleration or change in the motion of an object.

Newton's first law of motion states that an object in a state of rest or uniform motion in a straight line, will continue in that state unless acted upon by an external force.

The second law states that the force applied to an object is directly proportional to the product of mass and acceleration of the object. The object tends to move in the direction of the net force.

Acceleration is defined the change in the velocity per change in the time of motion of the object.

where;

Thus, we can conclude that net force causes an acceleration or change in the motion of an object.

Learn more here:link

their crystal patterns have been disrupted by stress