I think that it’s b because it’s kinda like what goes along with the question and what makes sense the most!!!!!
Answer:
China really needed the economic and military aid promised by the Soviets. Nonetheless, Mao sent more ethnic Korean PLA veterans to Korea and made a promise to move an army closer to the Korean border.
Explanation:
4) African economies became dependent on the sale of cash crops and raw materials.
Manifest destiny was the belief that white settlers destiney from God was too move to the west and expand their country.
If you want good sources go to wikipedia and look at the sources used in the wikipedia article. DO NOT USE THE WIKIPEDIA ARTICLE ITSELF AS A SOURCE!