You show 6-month-old Zachary many pictures of two objects. At first he looks at each picture for several seconds, but after several are shown he just glances at each briefly then looks away. Then you show him a picture of three objects

What would you expect him to do?
a. Look at the picture briefly then look away, because to him it looks just like a picture with two objects.
b. Look at the picture with renewed interest for several seconds, because he will recognize that three objects are different from two objects.
c. Look at the picture and say, "1, 2, 3."
d. Start crying and refuse to look at the picture because it is unfamiliar.

b