Around 2 Months, Babies

Multiple Choice

Around 2 months, babies

A) can keep track of an object that travels on a curvilinear course at varying speeds.
B) realize that a moving rod whose center is hidden behind a box is a complete rod rather than two rod pieces.
C) first perceive that a ball that moves back and forth behind a screen moves in a continuous path.
D) first begin to perceive an object's size as the same, despite changes in the size of its retinal image.