Aprofessor is working with five teams in his marketing research class. he decides to experiment with path-goal theory in these groups accomplish their off-campus studies. group a has done a project for him before. he gets them setting challenging goals and seeks to get them to produce an even better project this time. with group b he provides very specific guidelines, sets deadlines, and lays out the rules of the class and project. he lets group c manage their own task. he encourages them, works on building a strong rapport with them, and tries to meet their needs related to the project. by the time he gets to group d, he discovers they're already lost, confused, and a week behind everyone else. he sets a work schedule for them and provides step-by-step guidelines regarding the project so they won't get confused or distracted again. refer to table 13.4. with group a, the professor is using: a) an instrumental style. b) a supportive style. c) a participative style. d) an achievement-oriented style.