According to$\_\_\_\_\_\_\_,$ manufacturing plants across the United States were hiring experts to perform$$ time$-$and$-$motion studies: Industrial engineering techniques were applied to each facet of a job to determine how to perform it most efficiently.

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Part $1$

A$.$

Theory Y

B$.$

the Hawthorne effect

C$.$

scientific management

D$.$

Theory X

E$.$

$$Maslow$\text{'}$s hierarchy of needs