Answer:
The correct answer is Evaluator-critic.
Explanation:
According to Kenneth Benne and Paul Sheats' Functional Roles of Group Members, Donna is taking the role of an Evaluator-critic. This role is part of the "Task Roles" defined by them, in which people take on a specific role within a work group to get a project done.
The Evaluator-critic analyzes the functionality of the group and all the proposals made. They make sure they are in line with the objective of the project they're working on and also strive to keep a high level of performance. In this particular case, Donna reviews Henry's proposal and assesses that it's an innovative approach but still not a good fit for their particular work group.
