When researchers compared 4-month-old Japanese infants' cortisol responses with U.S. infants' responses during an inoculation, what did they discover?
A. Japanese infants had high cortisol response coupled with little crying.
B. U.S. infants had high cortisol response and displayed intense behavioral reactions.
C. Japanese infants had low cortisol response coupled with little crying.
D. U.S. infants had low cortisol response and displayed little crying.
Answer: A
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