【单选题】Meta-analysis made which development in the study of leadership possible? (3.2)
A.
isolating studies to separate out the results for the most important one
B.
comparing results of many studies to formulate better theories about leadership traits
C.
showing that a leader in one situation may not be a leader in another
D.
introducing the concepts of focus on people and focus on results
E.
observing the changes a leader needed to make to become a Great Man