问题详情

Why does the professor mention the expressions "mother tongue" and "motherese"？
A．To prove that mothers are better language role models than fathers.
B．To illustrate how parents provide a support system for language learning.
C．To compare normal speech patterns with the baby talk that parents use.
D．To argue that second language learning is more difficult for adults.请帮忙给出正确答案和分析，谢谢！