Why do cats natrually no to use the litter box?

Question

my cat had a kitten and it naturally knew too use the litter box why

Answer 1

Burying their p**p is instinctive. Otherwise, it would harbor bacteria and contaminate their living space. Gravel is a good medium for p**p-burying, so of course they want to go in the litter box.  

Answer 2

Well, it is actually taught by their mother. They do it so the can hide their f***s from other predators.