Final answer:
Structural family therapy assumes that a family can best be understood when it is analyzed from a multi-generational perspective.
Step-by-step explanation:
The approach that assumes that a family can best be understood when it is analyzed from a multi-generational perspective is a) Structural family therapy.
This therapeutic approach focuses on understanding the patterns and dynamics within a family system over multiple generations.
By examining the history, interactions, and relationships of different family members, structural family therapy provides insights into the root causes of conflicts and issues within the family.