A

Step 1: Understand the concept of uniform circular motion. In uniform circular motion, a body moves in a circular path with a constant speed. Although the speed is constant, the direction of the velocity vector is continuously changing, which means that the body is accelerating.
Step 2: Identify the type of force involved. The acceleration that keeps the object moving in a circle is directed towards the center of the circular path. This inward force required to maintain circular motion is known as centripetal force.
Step 3: Analyze the options:

• Option A: Centripetal force - This is the correct answer as it describes the force needed to maintain circular motion.
• Option B: Centrifugal force - This is often misunderstood; it's not a real force acting on the object but rather a perceived force felt in a rotating frame of reference.
• Option C: Resistance - This does not specifically relate to the forces acting in uniform circular motion.
• Option D: None of the above - This is incorrect as option A is valid.

Conclusion: The force required to keep a body in uniform circular motion is the centripetal force.
Therefore, the correct answer is A.