Which of the following practices can make a group's decision-making process more effective?
a. permitting member roles to remain uncertain.
b. requiring agreement that the decision is the optimal one.
c. promoting the use of groupthink.
d. forming smaller groups and working groups.

Option (c) is correct.

Promoting the use of group-think can further make a group's decision-making more efficient and effective. Group-think is a cognitive or intellectual phenomenon that arises within a group of individual where they aspire for harmony or consonance in the group which earlier would've resulted in an preposterous or dysfunctional outcome.

answermeasured by how well she or he does the job'; /