Answer:
A. the illusion of invulnerability
Explanation:
This group will most likely develop overconfidence in any future task assigned to them. This is based on the fact that they have a repetitive history of successfully completing its project in time. By being overly optimistic , analytical thinking can be eliminated and these symptoms of groupthink are referred to as the illusion of invulnerability. The group therefore can end up taking too much risk as the members feel that no obstacle can hinder them from being successful in their projects.