Answer:
C. Schemes of world domination and foreign revolutions
Step-by-step explanation:
After reading Franklin Roosevelt's "State of the Union Address, 1941" excerpt, we can answer this question. A few sections from the end, there is a part that reads the following:
"A good society is able to face schemes of world domination and foreign revolutions alike without fear."
This is the clear answer to the question about what a "good society" should be able to defend itself against.