An assembly for the discussion of common concerns that features experts in a given field who take opposite sides of an issue in a panel discussion and includes the opportunity for audience participation is known as a:

forum

Explanation:

A forum is a discussion that takes place among common people in the pressence of experts in the field in which the discussion is taking place.

The topic is analyzed through discussions in the favor of the motion and against the motion. This helps the people to critically think about the topic and arrive at the best path to take. It is a good way to deal with problems that everyone is dealing with as nobodies opinion is left unsaid.

Hence, the statement here describes a forum.

the answer is:

c. economic output

answer; block grants;