Uniform circular motion of an object is -

Concept:

Acceleration:

• The rate of change of velocity is called acceleration. 
• Velocity is a vector quantity and so is the acceleration. 
• Velocity is the speed with direction. Change in either speed and direction or both means the motion is accelerated. 

Explanation:

• An object moves in a circular motion by centripetal force which is directed toward the center. 
• In a circular motion, the direction of the body changes at each point of motion. 
• Even if the speed is constant (uniform motion), the body is accelerated as direction keeps on changing. 
• The magnitude of the centripetal acceleration responsible for the circular motion is

v is the speed of the body in a circular motion, r is the radius of motion and a is acceleration

'accelerated motion' is correct option.