Which Statement Is an Example of Attitude Cutoff

Which statement is an example of attitude cutoff?

A) A mother says, "Mary, you can't have six cookies," while handing the child two cookies. The child cries instantly when she hears the word "can't."
B) A teacher says, "It's time to clean up," and none of the children stop playing.
C) John just called Petey a baby. Petey stops listening because he's thinking of the right word to call John.
D) All of these answers are correct.
E) None of these answers are correct.