Three-Month-Old Lionel Loved to Suck on His Fingers

Multiple Choice

Three-month-old Lionel loved to suck on his fingers. He was quite fond of putting his fingers in his mouth and then pulling them out only to look them over for a minute or two before putting them back in his mouth. He repeated this behavior over and over. Lionel's behavior with his fingers illustrates a __________.

A) simple reflex
B) primary circular reaction
C) secondary circular reaction
D) tertiary circular reaction