Which of the following is a clue that something has been erased on a document?

I suppose this should have choices. Usually, a black felt pen would be used to cover some words and sentences. If an erasure has been used, a white ink has been used to cover some words. If a rubber erasure has been used, one will find bits of rubber around the paper and on the floor of the place where the paper was stored

Bc they get tired from playing with other kittens