Asecondary group is characterized by
a. members who are not interchangeable.
b. intimate relationships.
c. a limited number of members.
d. instrumental relationships.

(D) instrumental relationships

Explanation:

A group is defined as collection of humans that share certain characteristics and interact with one another

A primary group is typically a small social group whose members share close, personal and enduring relationships. e.g. family

However, a Secondary group is a large group whose relationships are often impersonal and goal oriented. Their relationships are temporary. e.g A cooperative society