Solution:Physical proximity, similarity of background, and limited self-interest are elements that belong to the primary group in sociology.
Primary groups are characterized by close, personal, and enduring relationships such as those found in families and close friendships. Physical proximity allows for regular interaction and the development of strong bonds.
Similarity of background facilitates mutual understanding and shared experiences. Limited self-interest ensures that members prioritize group welfare over individual gains.
Large size, on the other hand, is not typical of primary groups, which are usually small to maintain closeknit relationships.