Answer:
Option (C)
Step-by-step explanation:
The time period of simple pendulum is defined as the time taken by the bob to complete one oscillation.
The formula to calculate the time period of a simple pendulum is given by

Time period depends on the acceleration due to gravity and the effective length of the pendulum.
The effective length is the sum of length of cord and the radius f bob.
The effective length of the pendulum is defined as the distance between the point of suspension and the centre of gravity of the bob.