The correct option is C Apple falling from a tree
Motion which repeats itself after a regular interval of time is called periodic motion.
The beating of the heart of a healthy person is periodic in nature as it repeats after a fixed interval of time. Similarly, the motion of a pendulum and the moon’s motion around the earth are also periodic in nature.
But once an apple falls off a tree, it stays on the ground. Since the motion is not repeated, therefore it is not periodic in nature.
The motion of an apple falling from a tree is an example of the rectilinear motion as it falls vertically down due to gravity.