Infants in Kellman and Spelke's Habituation Experiment Looked at a Rod

Multiple Choice

Infants in Kellman and Spelke's habituation experiment looked at a rod that was covered by a block. They were better able to perceive the rod tips as part of a whole rod when

A) verbal hints were given by the researcher.
B) the rod moved back and forth behind the block.
C) the opaque block was briefly made transparent.
D) candy rewards were supplied for the correct answers.