What is the main idea of the passage？A．A doll－playing exercise may help to train new paren

What is the main idea of the passage？

A．A doll-playing exercise may help to train new parents.

B．How couples play with dolls predicts their parenting style.

C．What preparation is needed to become new parents.

D．How co-parenting issues relate to a happier marriage.

请帮忙给出正确答案和分析，谢谢！