All but one of the following are major findings of the Hawthorne studies summarized by Miner (1988):

A. Level of productivity is set by social norms, not by physiological capacities
B. Non-economic rewards and sanctions significantly affect the behavior of the workers and largely limit the effect of economic incentive plans
C. Increases in productivity occur when employees perceive their employers as part of their family
D. Often workers do not act or react as individuals but as members of groups

C. Increases in productivity occur when employees perceive their employers as part of their family