A new family in town has joined a local church and enrolled their children in the Sunday morning ...

A new family in town has joined a local church and enrolled their children in the Sunday morning religious school. Members welcome the family by inviting the parents to join the adult prayer group on Wednesdays.
 
  The parents explain that they are not very religious, but have joined the church because they believe in providing a religious education for their children. What perceptual principle explains this scenario?
  a. proximity principle
  b. similarity principle
  c. closure principle
  d. simplicity principle
  e. selection principle