In Terms of the Historical Study of Motivation, What Was

In terms of the historical study of motivation, what was so important about the fact that motivational thinkers began to emphasize the active nature of the person?

A) a focus on naturally occurring instances of motivation outside the research laboratory.
B) an ideological shift away from studying animal, biological, and evolutionary motivational constructs.
C) the emergence of motivation study as the most important field in the study of psychology.
D) the understanding that motivation is a constant, fluctuating, and universal aspect of every living person.