Answer: E) Acceleration, net force
Explanation: In order to explain this problem we have to consirer that the uniform circulat motion has constant angular velocity (ω) and the vector velocity is changed its direction for any point that cover the circle but its modulus is contant and its value is v=ω*R.  In order to ensure these conditions, the net force also the accelaration called centripetal must point to the center of the circular trajectory.
The quantity that points towards the center of the circle in uniform circular motion is acceleration, net force. That is option E.
A uniform circular motion is the motion of a particle or an object that is moving at a constant speed on a circle.
Acceleration is defined as the rate at which the velocity of a moving object changes with time.
The acceleration in a uniform circular motion is along the radius and towards the center.
This type of acceleration is referred to as the centripetal acceleration while the force acting on the object to cause its inward movement is called centripetal force.
Learn more about circular motion here:
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