Answer: B. familiar and commonly used in many stories.
A stock character is a character usually fictional or stereotypical used in a piece of art like a play, novel, or film, which the audience recognizes from other works. In simpler terms, a stock character is a recurring character in a literary tradition. Stock characters are very useful in a variety of genres as they can help in the identification of a genre or a subgenre. They also help to save time and effort in formulating new background stories about them.