The diagram shows the 44 nations that occupy the continent of Europe. (The diagram excludes Russia, which occupies both Europe & Asia.) Every dot is a smaller nation, with a national population less than 500,000; the circles are nations each with more than half a million people. Those nations in the "NATO" circle, as of 2013, are members of the NATO military alliance. Those nations in the "euro" circle, as of 2013, use the euro as their primary currency.
Consider the nation represented by the single dot inside the left circle but outside the right circle. This dot has to represent which of the following nations?
A. Iceland (population = 103,000); NATO member; primary currency = krona
B. Latvia (population = 2,067,900); NATO member; primary currency = lats
C. Luxembourg (population = 448,569); NATO member; primary currency = euro
D. Montenegro (population = 616,258); not a NATO member; primary currency = euro
E. Vatican City (population = 900); not a NATO member; primary currency = euro
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