Which of the Following Statements Defines a Social Group

Which of the following statements defines a social group?

A) It refers to a complex and structured secondary group designed to achieve specific goals in an efficient manner.
B) It refers to two or more people who are allocated the same task.
C) It refers to a formal organization designed to accomplish goals and tasks in an efficient and rational way.
D) It refers to two or more people who share some attribute and interact with one another.
E) It refers to an organized and established social system that meets one or more of a society's basic needs.