Centripetal Forces

For a particle moving in a circle, the net force acting on the particle is the centripetal force, which is given by: Here, is the mass of the particle, is its speed, and is the radius of the circular path.
In this case, the net force on the particle is provided by the tension in the string.
The tension in the string provides the centripetal force needed for circular motion.
Therefore, the net force directed towards the center of the circle is equal to the tension in the string.

The correct answer is (A) : T.