According to Chester I. Barnard, willingness to serve, common purpose, and _____________ are the principal elements in an organization or cooperative system.

A) Interpersonal trust
B) Labor-management cooperation
C) Communication
D) Human motivation
E) Individual needs

Chester I. Barnard

An American business executive and author, recognized for his contributions to management theory, particularly in the field of organizational studies and corporate management.

Cooperative System

A form of organization or interaction where different parties work together towards common goals, often emphasizing collaboration and mutual benefit.

Interpersonal Trust

The belief in the reliability, integrity, and honesty of another person, forming the basis for cooperative interactions and relationships.