Answer:
The correct answer is b) When strong group commitment is needed to decide methods to reduce project scope
Explanation:
Group decision-making is a process in a group of persons that are operating collectively, they analyze and evaluate circumstances to take the best decision of a situation.
For the current question, "When strong group commitment is needed to decide methods to reduce project scope", it is a clear example of group decision-making because the announcement is talking about a group of persons that will decide to reduce project scope.