The structure of FDR's fireside chat is effective. This is evident from the similarities he is drawing between the actions of Japan and the actions of Germany. His goal in drawing these parallels is to show the American people that war is necessary to stop Japan from continuing their reign of terror. Along with this, the US must defend their honor after being attacked by Japan at Pearl Harbor.
Ultimately, FDR central idea that the Japanese need to be stopped before they continue to attack other innocent nations is well explained and uses multiple examples to show that this trend can continue unless America stops them.
The reason for the decline of the Heian Dynasty in Japan was "<span>Elite clans amassed most of Japan's lands into vast estates".</span>
I would say B, not 100% sure
A. Edwin Denby and Albert Fall