Final answer:
The subject of this question is English and it involves choosing the word that best completes the given sentence about control from black countries.
Step-by-step explanation:
The subject of this question is English. The question requires choosing the word that best completes the given sentence. In this case, we need to determine the word that fits best with the phrase 'control from black countries'. Looking at the provided options, the word that makes the most sense is 'immigration' (option c). Immigration refers to the movement of individuals from one country to another with intent to settle permanently.
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