To Assess Whether Infants See Objects as Continuous or Discontinuous

To assess whether infants see objects as continuous or discontinuous, researchers present babies with a display that includes an object, such as a rod, this is partly hidden by another object, such as a block. How do the researchers determine whether the infants see the hidden object as continuous or as two separate objects?

A) Researchers measure whether infants move their heads up and down in an attempt to see around the block.
B) Researchers hand the rod to the infant and observe their actions on it.
C) Researchers observe whether the infants try to remove the block.
D) Researchers later present the rod as a single object or two shorter rods and measure which the babies look at the longest.