Years ago, when most organizations were based on the hierarchical

More to do with concision, it looks


A. Years ago, when most organizations were based on the hierarchical business model of the Industrial Age, great leaders were those who were unemotional, rational, and even mechanistic --- coloured part redundant

B. Years ago, when most organizations were based on the hierarchical business model of the Industrial Age, great leaders were unemotional, rational, and even mechanistic. ---- Concise choice

C. Years ago, when many organizations were based on the hierarchical business model of the Industrial Age, leaders who were great were unemotional, rational, and even mechanistic. --- coloured part redundant
D. Years ago, when most organizations were based on the hierarchical business model of the Industrial Age, leaders who were great were unemotional, rational, and also mechanistic --- coloured part redundant

E. Years ago, when many organizations were based on the hierarchical business model of the Industrial Age, great leaders were those who were unemotional, rational, and also mechanistic. ---- coloured part redundant