Delores Repeatedly Showed Curtis,her Two-Month-Old,a Picture of His Grandfather

Multiple Choice

Delores repeatedly showed Curtis,her two-month-old,a picture of his grandfather.She noticed that Curtis seemed to become less interested in looking at the picture each time she showed it to him.Then she showed Curtis a picture of his grandmother,and he looked at it as long as he had first looked at his grandfather's picture.Curtis's loss of interest in his grandfather's picture demonstrates

A) habituation of attention.
B) a conditioned response.
C) an operant response.
D) recovery from habituation.