During his research on modern production systems, workers at a leading automobile manufacturing firm told Professor Roberts that these systems end up encouraging temporary or contract employment and reducing their quality of life.(A) During his research on modern production systems, workers at a leading automobile manufacturing firm told Professor Roberts that these systems end up encouraging temporary or contract employment and reducing their quality of life.
(B) Modern production systems were encouraging temporary or contract employment and reducing their quality of life was told to Professor Roberts by the workers at a leading automobile manufacturing firm.
(C) Professor Roberts was told by workers at a leading automobile manufacturing firm that these systems ended up encouraging temporary or contract employment and reducing their quality of life, during his research on modern production systems.
(D) During his research on modern production systems, Professor Roberts was told by workers at a leading automobile manufacturing firm that they were meant to encourage temporary or contract employment at the same time reducing their quality of life.
(E) Professor Roberts, during his research on modern production systems, was told by workers at a leading automobile manufacturing firm that these systems ended up encouraging temporary or contract employment and reducing their quality of life.