While groups exhibited the highest level of productivity, task completion for groups achieved at only a slightly lower level.

a. authoritarian-led; laissez-faire-led
b. democratic-led; authoritarian-led
c. laissez-faire-led; democratic-led
d. authoritarian-led; democratic-led

The answer is letter A.

Explanation: Authoritarian-led is a type of leadership that is characterized by the control of an individual, the leader, over all decisions and little consultation with the opinions of team members. In this case the leader do not let others give ideas, but the productivity is high because they give all directions.

Laissez-Faire-led allows total freedom for individual or group decision-making, participating only when requested. Liberal leadership emphasizes only the group. Even if freedom is good thing, but this can led to some problems such as conflicts and lack of production.

answer; gender,race,age,/// (d) all of these;