According to the passage, ______ is the key factor to making "Nowcasts" a reality.

A．Children are more 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.

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 war their parents speak quickly when they go to school.
C．It has been proved that peers have more impact on children's qualifies 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.