The Ohio State Studies of Leadership Differed Most Conspicuously from Similar

The Ohio State studies of leadership differed most conspicuously from similar studies at the University of Michigan in that the Ohio State studies:

A) concentrated on the differences between managers at different levels of the organisation.
B) used only the data collected during inductions of men into the US Army during World War I.
C) focused on types and patterns of rewards different managers use.
D) identified two continuums of leader behaviours and not just one.