George, Donna, and Maria are on the five-member Benefits Task Force that is researching options for the new benefits package. Over lunch, George suggests that going with the Members' Choice HMO is the best course of action, and Donna and Maria agree with George for the sake of unanimity, without ever researching and accurately assessing the decision. George, Donna, and Maria are engaged in .

Groupthink

Explanation:

George, Donna, and Maria are on the five-member Benefits Task Force that is researching options for the new benefits package. Over lunch, George suggests that going with the Members' Choice HMO is the best course of action, and Donna and Maria agree with George for the sake of unanimity, without ever researching and accurately assessing the decision. George, Donna, and Maria are engaged in groupthink.

Groupthink is a phenomenon or situation in which the members of a team agree on a discussion without fully evaluating it for the sake of harmony in the group, It occurs when group members strive to agree for the sake of unanimity and thus avoid accurately assessing the decision situation.  

i would say b. research typically uses a variety of sources