An association among three entities is called: A. none of these. B. recursive relationship. C. binary relationship. D. ternary relationship.

Break Down the Problem

1. Identify the relationship types defined in the options: recursive, binary, and ternary relationships.
2. Clarify the terminology associated with the number of entities involved in each relationship type.

Relevant Concepts

1. Recursive Relationship: A relationship where an entity relates to itself.
2. Binary Relationship: A relationship involving two entities.
3. Ternary Relationship: A relationship involving three entities.

Analysis and Detail

1. The question asks about an association involving three entities, which corresponds directly to the definition of a ternary relationship.
2. Evaluating the other options:
   • A recursive relationship would only involve one entity relating to itself.
   • A binary relationship involves only two entities.

Verify and Summarize

Given the definitions and analysis of each relationship type, it is clear that the association among three entities specifically aligns with the concept of a ternary relationship.

Final Answer

D. ternary relationship.