The state of motion of an object refers to its:

Remember Newton's first rule of motion, which states that a body maintains its current "state of motion" unless and until it is affected by an outside, unbalanced force. It may be assumed that the state of motion relates to a body's velocity since we know that applying force to a body tends to affect its velocity.
 

The pace and direction of a body's motion are indicated by its velocity, hence the state of motion also refers to the body's speed and direction of motion.
When an imbalanced external force occurs on a body, it causes acceleration (a change in velocity per unit of time), which modifies the body's speed and direction of motion depending on the force's direction. As a result, the body's condition of motion is altered.

Hence, the correct answer is option A.