Which of the Following Represents an Occurrence of Overregularization

Which of the following represents an occurrence of overregularization?

A) Alek uses the word 'cat' to only refer to his own cat.
B) Bern tells his mother that he 'wented' to the store with Daddy.
C) Callum says 'doggie sad' when he sees a howling dog on TV.
D) Dylan starts using a swear word after hearing his mother say it once.