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.
Answer: B
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