Burt, Ryan, and Heather are members of the marketing team at Model Industries, Inc. (MII), responsible for generating ideas for new marketing strategies. Burt has done a phenomenal job in gathering the information necessary to help the team understand the desires and needs of the client. All things being equal, Heather has the best record of making good recommendations to Jeremy, vice president of marketing. Ryan can make some good recommendations, but sometimes his recommendations are completely off base. Usually, Jeremy pays careful attention to what Heather has to say but generally does not pay much attention to what Ryan proposes. In addition to Jeremy, Heather has been meeting with the vice president of operations and other members of the executive team to gain support for their request to increase the marketing budget. According to research, the best way for Burt, Ryan, and Heather to improve their team hierarchical sensitivity would be to implement ___________. 

a. Action learning 

b. Nominal group technique 

c. Collaborative problem-solving 

d. Brainstorming 

e. Personal clarification