Respuesta :
The correct option is B
The dissolution of the USSR was a political issue, nor did the economic situation cause a general discontent of the population that continued to prefer the Soviet system. The dissolution of the USSR caused much worse economic problems to the Russian population than the previous decade.
The USSR during the 1980s had tense relations with the USA, while China, which was a country with material conditions objectively much worse than the USSR decided to approach the USA, which allowed them some relief. In any case the Chinese hierarchs did not consider at any moment to realize some type of opening as delayed would try Gorbachov.
I believe the correct answer would be letter D.
After the fall of USSR in 1991, China and Russia engaged in reapprochement relations (they were rivals since 1961, with high possibilities of declaring war against each other, and actually engaging in a minor border war in 1969. Rumors of several invasions from both sides, although not proven, existed).
In 1994, Russian and Chinese officials signed an agreement on the Sino-Russian (Chinese-Russian) Border Management System aiming to facilitate border trade and reduce criminal activity at these regions.
In 2004, a Complementary issue of this agreement stated that Russia would transfer a few island and islets to China's possession, with the intention of fostering the reconciliation feeling between the two nations. The two nations hard border dispute dated since Manchuria Japanese invasion, in 1931.