Final answer:
The behavior most in line with a delegative leadership style is allowing the group to independently define the problem and develop a solution, which reflects a laissez-faire approach.
Step-by-step explanation:
In Vroom’s Time-Driven model of leadership, using delegative leadership means opting for a leadership style where the leader assigns responsibility for decision-making to group members. The correct behavior associated with delegative style, from the given options, is option a: You allow your group to define for itself the exact nature and parameters of the problem and then develop a solution on its own. This choice aligns with the notion of a laissez-faire leader, who takes a hands-off approach and trusts the group members to manage themselves and make their own decisions, which can be beneficial if the members are mature and self-motivated. It contrasts with authoritarian and democratic leadership styles—the former involves the leader making decisions alone, while the latter involves seeking consensus in a participative manner.