The word "ditched" ( Line 1, Para. 4) could best be replaced by ______.

A．It is harder to track the precise effects of parental upbringing than the exact influence of the peer group in children.
B．Immigrant children tend to discard the way their parents speak quickly when they go to school.
C．It has been proved that peers have more impact on children's qualities such as to be honest or hard-working or generous.
D．It is easier for children to acquire a language at school than at home.

A．Children are most influenced by their peers than by their parents.
B．Twins are quite different if they are reared in two separate families.
C．Identical twins reared in the same home are different in personality.
D．Nurture has a less significant effect on children's personality development.