Which is inappropriate and a piece of research writing with a formal tone?
A. If the cat is clawing Furniture, provide a scratching post or two for the cat to use instead.
B. with careful training, cats can even be trained to use the toilet instead of a litter box!
C. I think cats are far more independent than most dogs, because my cat often doesn't obey my commands
D. Cat owners say that their cats provide them with loving companionship and affection.