An Organism That Causes Infection as a Result of a Dog

An organism that causes infection as a result of a dog or cat bite was tested for catalase,resulting in a positive reaction.What could be the possible source of the error?

A) The catalase reagent could be expired.
B) This organism is normally negative for catalase;therefore a mutation may have occurred.
C) A false-positive result occurred because of the catalase production of the red blood cells in the 5% sheep blood agar.
D) No error is present.This organism is catalase-positive.