GMAT Critical Reasoning (CR) | Re: Advanced CR: Bold Face

Public health expert:Increasing the urgency of a public health message may be counterproductive. In
addition to irritating the majority who already behaveresponsibly, It may undermine all government
pronouncements on health by convincing people that such messages are overly cautious . And there
is no reason to believe that those who ignore measured voices will listen to shouting.
The two sections in boldface play which of the following roles in the public health expert's argument?

(A) The first