In the following examples, which represents periodic but not simple harmonic  motiona) Rotation of earth about its own axis      b) Revolution of moon around the earthc) Swinging pendulum from a fixed axis       d) Marble released from top of a smooth hemispherical bowl

Any to and from motion which is also periodic is said to execute simple harmonic  motion.Statement: (a):- It is periodic but does not have a to and pro motion. Hence the right  statement.Statement: (b):- It is periodic but does not have to and pro motion about a fixed  point. Hence the right statement.Statement: (c):- It is periodic and also has to and pro motion about a fixed point  making it a simple harmonic motion. Hence a wrong statementStatement: (d):- It is periodic and also has to and pro motion about a fixed point  making it a simple harmonic motion. Hence a wrong statement.This makes option (1) the right answer