The discovery of oil in South Sudan sparked the independence movement that eventually led to the division of country.
The Oil was discovered in Bentu and Heglig districts of South Sudan in 1978. The central government in Khartoum took over the oil districts of South Sudan which sparked rebellion in South Sudan and on the other hand South Sudan wanted to have a greater share in oil revenue. It resulted into conflict in Sudan for a long time and ultimately on 11 July 2011 South Sudan attained her Independence and thus lead to division of Sudan.
The American military operation aimed to buy time by gradually bolstering the South Vietnamese military's power and re-equipping it with cutting-edge weapons so that it could defend its country on its own. The Nixon Doctrine's foundation was established by this policy.
The final American combat soldiers left South Vietnam two months after the Vietnam Peace Agreement was signed, and Hanoi has since freed most of the surviving American POWs detained in North Vietnam. The United States eight-year direct involvement in the Vietnam War came to an end.
North Vietnam's aim to unite the entire nation under a single communist dictatorship based on those of the Soviet Union and China, which had overthrown the French colonial administration of Vietnam in 1954, was at the core of the struggle.
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The answer to that would be either A or C
