The Hawthorne studies conducted by Elton Mayo and his colleagues focused primarily on: a. Assessing the impact of technology on work efficiency. b. Analyzing the effects of organizational structure on employee performance. c. Evaluating the impact of financial incentives on employee productivity. d. Exploring the role of social and psychological factors in the workplace. e. Investigating the effects of leadership styles on employee motivation. f. Examining the relationship between physical working conditions and job satisfaction