The Hawthorne studies conducted by Elton Mayo and his colleagues focused primarily on:

a$.$

Examining the relationship between physical working conditions and job satisfaction.

b$.$

Evaluating the impact of financial incentives on employee productivity.

c$.$

Assessing the impact of technology on work efficiency.

d$.$

Investigating the effects of leadership styles on employee motivation.

e$.$

Exploring the role of social and psychological factors in the workplace.

f$.$

Analyzing the effects of organizational structure on employee performance.