Which statement best describes acceleration?
acceleration is the rate of change of force of an object.
acceleration is the rate of change of the direction of an object.
acceleration is the rate of change of velocity of an object.
acceleration is the rate of change of position of an object.

Acceleration is the rate of change of velocity of an object

Explanation:

Rate means, that quantity over time

And mathematically,

Acceleration=velocity/time

Which means that acceleration is the rate of change of velocity of an object.

''The rate of velocity of an object is used to define acceleration at its best terms''. This is the statement which describes acceleration.

Option C

Explanation:

Acceleration is the rate of change of velocity of an object. Velocity is different from speed because velocity is a vector quantity. Acceleration occurs due to change in position as the time varies from its original position.

Rate of change of position and force doesn't have predominant effect on acceleration. Therefore velocity is the most suitable to define acceleration.