What is true about the series of visual cliff experiments?
a. Infants younger than 6 months do not have depth perception.
b. Three-month-olds showed heart rate acceleration, which means they recognized the depths were different.
c. Twelve-month-olds crossed or didn't cross the cliff based on their mother's facial expression on the other side.
d. Three-month-olds' slowed heart rate showed that they understood the different depths and were thus hesitant to cross the visual cliff.
Answer: C
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