Which cause and effect relationship is correctly matched?

ACommunists rule North Korean-China and the Soviet Union back North Korea
BFidel Castro assumes power in Cuba-the U.S. backs the Castro regime
CThe mujahedeen rise in Afghanistan-the Soviets back the mujahedeen
DThe Sandinistas take power in Nicaragua-the U.S. backs the Sandinistas

Verified Answer :

"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.