Amy, a team leader at a consumer goods industry, gives her team members optimistic and constructive feedback and acknowledges individual contributions. in this scenario, amy is encouraging group member development by

Providing supportive leadership

Explanation:

The supportive leadership is among the type of leadership in which the leader who is leading a team listens to the every individual of the team carefully in order to help the members deal with the stress and the problems they are facing so as to increase the productivity.

It also includes providing every member of the team an equal amount of attention.