Correct Option (D)
Statement 2 explicitly identifies intimacy as an essential characteristic of a primary group. Consequently, members of a primary group are known to each other intimately. This option directly reflects the core definition provided in the statements.
Incorrect Options:
Option A: All families are primary groups. Statement 3 indicates that "A family may be an example of a primary group," implying that not every family necessarily functions as a primary group. Large, extended families or those lacking close personal interaction among all members might not fit the definition of a primary group, which emphasizes intimacy.
Option B: All primary groups are families. While a family can be a primary group (Statement 3), primary groups are not exclusively families. Other examples include close-knit peer groups or small, intimate communities, demonstrating that primary groups encompass a broader category than just families.
Option C: A group of smaller size is always a primary group. Statement 1 notes that "A primary group is relatively smaller in size." However, small size is a necessary but not sufficient condition. A small group of individuals who lack intimate knowledge or personal interaction (e.g., strangers in a small waiting room) would not constitute a primary group, as intimacy is an essential characteristic (Statement 2).