A Father Says He Is Worried Because His Three-Year-Old Daughter

A father says he is worried because his three-year-old daughter is very upset about the birth of her baby sister,and he wants them to be close as they grow up.You tell him

A) they'll only feel close when they are adults and don't live together.
B) when they go off to school and have time away from each other, they will finally be able to feel close to each other.
C) even though they have some negative feelings at the time of the birth, by the end of the first year, most children have positive feelings and would like another sibling.
D) there is nothing he can do about the rivalry.