A Psychology Professor Decides to Play a Practical Joke on a Colleague

A psychology professor decides to play a practical joke on a colleague in the History Department.While the historian is giving a lecture on the first day of class,the psychology professor interrupts and asks to speak with her outside the classroom.While they are conversing,all the students leave through a back door and are replaced with a completely new group of students.Upon returning,the history professor continues her lecture without noticing that the students are different,illustrating:

A) change blindness.
B) apparent motion.
C) absentmindedness.
D) inattentional blindness.