Which cause and effect relationship is correctly matched?
a. Communists rule North Korean-China and the Soviet Union back North Korea
b. Fidel Castro assumes power in Cuba-the U.S. backs the Castro regime
c. The mujahedeen rise in Afghanistan-the Soviets back the mujahedeen
d. The Sandinistas take power in Nicaragua-the U.S. backs the Sandinistas
"a. Communists rule North Korean-China and the Soviet Union back North Korea" would be the best option, since both China and the USSR viewed this rise of communism power as their best option of spreading their overall influence in the region.