If the horse starts walking suddenly, then there is a reason for the possibility of the equestrian falling?

If the horse starts walking suddenly, then there is a reason for the p

1.	If the horse starts walking suddenly, then there is a reason for the possibility of the equestrian falling?
A.	moment of inertia
B.	law of conservation of mass
C.	rest inertia
D.	third law of motion
Answer» D. third law of motion