Answer:
C but give consideration to D.
Step-by-step explanation:
If you are speaking of this part alone, Roosevelt is pleading with the American People to pay more than the government for the war effort. (The US was not at war when this speech was delivered. War is actually 11 months away). But FDR knew things were brewing and he was patiently preparing the people for what he thought was going to happen.
So if you confine yourself to the part of his speech that you have quoted then the answer is the willingness to pay increased taxes.
If however you put this into a much broader context and look at the beginning of the speech then it is the willingness to uphold principles.
You have to decide how these questions are normally answered. Do you want part of the speech or all of it? What has been the practice in the past.
Myself, I believe that the taxation issue was just Roosevelt's warm up pitches. His real objective was uphold principles. This speech is called the 4 freedom's speech and that is what I think it is really about. So my answer would be D. But I think you expected to answer is C.