Debates in the US Congress allows members of Congress to

C. learn more about the pros and cons of adopting a new law

Explanation:

Debates allow the members of parliament to exclusively search for new aspects of the law. Both supporters and opposition members need to know the law thoroughly and could understand each other's propositions in a better way. Thus minutes flaws can be detected and could minimize to greatest possibility. Both the pros and cons of the proposed law would be discussed and interpretation from both sides could be heard.

the answer is: learn more about the pros and cons of adopting a new law

During the debate, both supporter and the opposition of the new law each would present their case on why a certain law is shouldn't or must be created. At this moment, they would be exposed to each other's idea and learn a couple new perspectives that they might not realize before the debate.