Answer:
The modern day controversy that best relates to Roosevelt's theme of "freedom from fear" is B. Military defense spending.
Step-by-step explanation:
When Roosevelt uttered the theme of "freedom from fear", he was alluding to the worldwide reduction of armament to an extent in which no country was afraid of suffering an agression from other nation.
In modern day, this would be related to the debate on military defense spending and whether we should spend more money in the military to protect our nation from foreign threats or on the contrary, cut the spending on military defense and focus on other areas like health care or education.