Which researcher(s) focused on how leaders motivate followers to accomplish designated goals?

A) Kotter
B) Fisher
C) Hersey and Blanchard
D) House

House is the researcher who focused on how leaders motivate followers to accomplish designated goals. He developed the Path-Goal theory, which identifies four leadership styles (directive, supportive, participative, achievement-oriented) and suggests that the leader's role is to clear the path for followers to reach their goals.