Baillargeon and Her Colleagues Found That When 2½­ Month­old Infants

Baillargeon and her colleagues found that when 2½­ month­old infants were shown an event in which an object appeared to pass behind an open window without becoming visible the infants were:

A) not surprised, even though this was an impossible event.
B) more attentive compared to a different condition where the object appeared behind the window.
C) less attentive compared to a different condition where the object appeared behind the window.
D) equally attentive in this condition compared to a different condition where the object appeared behind the window.