Final answer:
Roosevelt's fireside chats are an example of his attempt to prevent objections by explaining policies and regulations clearly, building trust with the public, and seeking their cooperation to support his agenda.
Step-by-step explanation:
The phrase that represents an attempt to prevent objections by Roosevelt's audience and support his agenda is found in his fireside chats, which served as a direct line of communication to the American people. By explaining the policies and regulations in terms the average citizen could understand, he preempted objections through transparency and education, hence creating an environment of trust and cooperation. In his speech on March 12, 1933, this approach is evident as he says, "I recognize that the many proclamations from State capitols and from Washington, the legislation, the Treasury regulations, etc., should be explained for the benefit of the average citizen. I owe this in particular because of the fortitude and good temper with which everybody has accepted the inconvenience and hardships of the banking holiday. I know that when you understand what we in Washington have been about I shall continue to have your cooperation as fully as I have had your sympathy and help during the past week."
By calling for the nation’s cooperation and assuring them of their role in the nation’s recovery, Roosevelt appeals directly to the public to join him in his efforts, thus creating a collective spirit and allaying any doubts or fears they might have regarding his policies.