What Did Frank and Lillian Gilbreth Discover in Their Study

What did Frank and Lillian Gilbreth discover in their study of fatigue in the workplace?

A) Fatigue occurs less often with specialization of tasks.
B) Lighting and the color of the walls had an effect on fatigue.
C) There was not a strong correlation between fatigue and job performance.
D) The more quickly a job could be done, the less fatigue was experienced.
E) Job stress did not lead to fatigue.

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