In which situation would we know that 2-month-old Brenda is exhibiting a social smile?

Question

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A social smile is a smile in response to social stimuli, such as a human face. Option A (in response to waking up from a nap) does not involve any social interaction, while option C (in response to finishing a meal) is a physiological response rather than a social one. Option D (in response to a cat's tail) also does not involve any social interaction. Therefore, option B (in response to seeing her mother's face) is the best choice for exhibiting a social smile.

In Which Situation Would We Know That 2-Month-Old Brenda Is