O Which of the following is TRUE of the Russian cross?
a. The Russian cross is another name for the Agricultural Triangle or Slavic Core.
b. The Russian cross is the Russian version of America's "Red Cross."
c. The Russian cross is the name given to the intersection of the disturbing trend lines of increasing death rates and falling birth rates in Russia that occurred during the mid-1990s.
d. The Russian cross is the name given to the pattern that appears on a map of population density of Russia.