What were some of the unusual aspects of how families were created in The Giver?

Whatever the person said above —

Families in the Giver are referred to as family units. Instead of people loving each other and starting a family, a male is assigned a female and they must be married for three years to apply for a child. One boy and one girl is allowed per couple, and they are given to the couple at the ceremony. The elders created this concept within communities.

Ithink it's a. but i could be wrong because it might be b. but it's not the other two