问题详情

The parents-children relationship changes from the relative positive to the relative negative when ______.
A．the children reach 7 or 8 years of age
B．the children reach 13 or 14 years of age
C．the parents begin to have too many household responsibilities
D．the parents begin to feel there is too much burden in the house请帮忙给出正确答案和分析，谢谢！