In a study in which infants were shown videos of a stranger either comforting or ignoring a crying infant, even 4-month-old-infants were more surprised by the video in which the stranger ignored the infant. This behavior shows that
Group of answer choices

infants' reactions are due solely to their genetic code.


infants' reactions to other infants are more pronounced.


infants only look at adults they might recognize.


infants have expectations about how other people will behave.