Two-month-old William smiled in response to his grandmother playing peek-a-boo with him. William's ...

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Two-month-old William smiled in response to his grandmother playing peek-a-boo with him. William's ...

Two-month-old William smiled in response to his grandmother playing peek-a-boo with him. William's response is a(n):
A) undifferentiated smile.
B) social smile.
C) indiscriminate smile.
D) emotional smile.

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