问题详情

Why does the author mention syllables pronounced with rising and falling inflections in lines 7-8 ？
A．To demonstrate how difficult it is for babies to interpret emotions
B．To illustrate that a six-week-old baby can already distinguish some language differences
C．To provide an example of ways adults speak to babies
D．To give a reason for babies" difficulty in distinguishing one adult from another请帮忙给出正确答案和分析，谢谢！