The acceleration of a body undergoing uniform circular motion is constant in:

Explanation

In this question, we are discussing the acceleration of a body in uniform circular motion. It is essential to understand that in such motion, the speed remains constant, but the velocity direction changes continuously. Acceleration is the rate of change of velocity, which has both magnitude and direction. However, in uniform circular motion, the acceleration only affects the magnitude of velocity, not its direction. This acceleration is called centripetal acceleration and always points towards the center of the circular path. The correct answer is therefore that the acceleration in uniform circular motion is constant in magnitude only. The other options are incorrect because acceleration does not affect the direction of velocity in this scenario.