Which of the Following Teachers Best Illustrates the Concept of "Discrimination

Which of the following teachers best illustrates the concept of "discrimination"?

A) Mr.Lemieux gives rewards each time a student holds a pencil when learning cursive writing
B) Mr.Price removes one minute of recess time for each minute that students are out of their seats in class
C) Ms.Wong stopped responding to Jim's bids for attention
D) Mr.LaPierre uses a handclap in gym and in science class to elicit different responses