A. It establishes basic principles on which everyone in the audience can agree.
Explanation: The option that best explains the role that the theme of freedom plays in this excerpt of President Roosevelt's "Four Freedoms" speech is it establishes basic principles on which everyone in the audience can agree. These four freedoms are the basic freedoms that all human beings have to have access to. These are the basic human rights, so everybody in the audience can agree to this. To defend these rights is why America, neutral up to that moment, has to enter the war.
B. It helps Roosevelt convince Americans that war is dangerous and
As war leads only to destruction.
Hope this helps
I go with A because feel like it's the best one