A. United Kingdom and Australia is not correct.

The United Kingdom, together with Portugal, has among the highest levels of income inequality in the European Union. However, with a Gini value of 35, even the famously unequal United Kingdom has less income inequality than the United States.

Even more surprising is the case of Australia. The country has long been considered very similar to the United States — with its dislike of taxes and environmental protection and its image of rugged individualism. However, on the crucial income front, it is even more egalitarian than the UK.

B. Germany and France is not correct.

Both Germany and France have a far more equal income distribution than the United States, with Gini values of just over 30. This is a level of income equality that the United States has never before experienced.

Of course, the United States is a larger and much more diverse country than either Germany or France. Still, the gap seems large when one considers that the three countries share the same level of development and have similar education levels, political systems and even demographic structures.

C. China and Thailand is not correct.

China and Thailand are both more unequal than the United States. However, with Gini values of around 45 points, only two points above the U.S. value, it's practically a statistical dead heat.

In China, which started its successful transition to capitalism with about half the level of inequality it currently has, the march toward income inequality has been especially striking.

While the country's inequality is largely a consequence of rapid growth, too much inequality, as witnessed today, may well begin to hinder future growth and make the country politically unstable.

D. Iran and Venezuela is correct.

Both Iran and Venezuela, two countries with whom the United States has very tense relations, have levels of income inequality that are almost the same as the United States, according to Branko Milanovic, author of "The Haves and the Have-Nots."

It is an odd situation for the United States to be in: to be among the most unequal of the advanced economies — and to be so uncomfortably close to two of its chief foreign-policy irritants.

And lest we forget, how about America's long-time nemesis, Russia? Despite the glitz and glamour of the Moscow billionaires, the country has a slightly lower level of income inequality than the United States.