Which Example Would Be the Most Helpful Way to Deal

Which example would be the most helpful way to deal with parents who are skeptical of early childhood education?

A) A teacher refers parents to the head of the school who will explain the benefits of activities.
B) A teacher informs parents of her credentials and assures them their children are learning skills.
C) A teacher tells parents to read a particular book about the skills learned by doing certain activities.
D) A teacher has parents observe an activity and describes the skills the children are learning from it.