Any body moving with simple harmonic motion is being acted on by a force that is:. a) proportional to a sine or cosine function of the displacement
b) directly proportional to the displacement
c) proportional to the inverse square of the displacement
d) constant

B

Explanation:

Because this oscillations occur when the restoring force is directly proportional to displacement, given as

F=-kx

Where k= force constant

X= displacement

the answer would be c. motion and direction

i hope this : )

that would be because of both gravity and friction. so     c