Which One of the Following Is Not One of the Conclusions

Which one of the following is not one of the conclusions of the Hawthorne effect?

A) They found that people change their behavior when they know they are being observed.
B) They concluded that human relationships influenced the behavior of workers and that new ideas were needed to explain work behavior.
C) They showed that human behavior and motivation is complex and is influenced by attitudes and feelings, the meaning that people assign to their work and their relationship at work.
D) The participation of the individual is necessary for cooperation but it is more important to build cooperation among organizational subunits as a crucial function of management.