Answer: Option (D) is the correct answer.
Step-by-step explanation:
An object moves with a constant speed when it has uniform circular motion. Due to change in direction this object accelerates.
Therefore, net force acts towards the center of circle which is also said to be inward force or centripetal force.
Thus, we can conclude that direction of the force is toward the center of the object's circular path that acts on an object undergoing uniform circular motion.