"Radical" and "agenda" were unfamiliar. I broke them down and used context to help determine their meanings.
a formal discussion on a particular topic in a public meeting or legislative assembly, in which opposing arguments are put forward.
The answer would be A. This is because the answer takes the information from the question and molds it into a statement. The other answers add unknown information to the statement, which makes it more confusing and unrelated to the actual claim.