If the direction of an object moving with uniform circular motion is reversed, what happens to the direction of the centripetal acceleration?

If the direction of an object moving with uniform circular motion is reversed, the direction of the centripetal acceleration is toward the centre of the circle. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help. 

Answer form flower;

Answer sample (c); // would be best because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest;