The Best Known Hawthorne Study Was That of Lighting-Level Effects

The best known Hawthorne study was that of lighting-level effects by Roethlisberger and Dickson (1939) .In this study employees were taken to a special room where lighting levels were varied from day to day to see how performance would be affected.They found that

A) performance depended not only on lighting level,but also on who an employee was working with that day.
B) newer employees did better with more light,while more experienced employees were unaffected by light conditions.
C) no matter how light levels were changed,productivity remained the same unless established work groups were broken up.
D) over the course of the study,productivity increased and seemed to have little to do with lighting levels.