What Does the Difference in Smiling Rates Between Infants Who

Multiple Choice

What does the difference in smiling rates between infants who are born premature and infants born on time tell us about the roots of the earliest smiles?

A) the first smiles are prompted by normal social relationships
B) beginning smiles requires advanced cognitive development
C) first smiles are controlled by older portions of the brain
D) first smiles require advanced motor control