Step 1: Understanding the Concept:
Kinship is classified into different degrees of closeness.
- Primary Kin: Individuals with a direct relationship. There are eight such relationships: Husband-Wife, Father-Son, Father-Daughter, Mother-Son, Mother-Daughter, Brother-Sister, Brother-Brother, Sister-Sister.
- Secondary Kin: The primary kin of one's primary kin (e.g., father's brother, i.e., uncle).
- Tertiary Kin: The primary kin of one's secondary kin (e.g., uncle's son, i.e., cousin).
Step 2: Detailed Explanation:
- (A) Husband-Wife, (C) Father-Son, and (D) Brother-Sister are all direct, one-to-one relationships, making them primary kin.
- (B) An Uncle is one's father's brother or mother's brother. This is not a direct relationship. It is mediated through a parent. Therefore, an uncle is a secondary kin.
Step 3: Final Answer:
An Uncle is a secondary kin, not a primary kin.