Meaning: 'One' refers to a single item or concept, in this case, indicating that overpopulation is a singular buzzword.

Wrong options:

• other: The word 'other' is a determiner that refers to additional items, which does not fit here as it implies more than one, while the sentence specifies a singular buzzword.
• over: The word 'over' is a preposition that does not function as a determiner and does not fit grammatically in this context.
• after: The word 'after' is a preposition that indicates time or sequence, which does not relate to the context of identifying a buzzword.
• out: The word 'out' is an adverb that does not serve as a determiner and does not fit the grammatical structure of the sentence.
• inside: The word 'inside' is a preposition that indicates location, which does not fit the context of identifying a buzzword.

Correct answer: over

Explanation: The word 'over' functions as a preposition indicating the action of being overwhelmed or dominated by something, which fits contextually as it describes the situation of developed areas being taken over by refugees.

Meaning: 'Over' indicates a state of being overwhelmed or surpassed by something, in this case, refugees.

Wrong options:

• other: The word 'other' does not fit as it does not convey the sense of being overwhelmed and is not a preposition.
• one: The word 'one' is a determiner that does not fit the context of describing the action of being run by refugees.
• after: The word 'after' is a preposition that indicates time or sequence, which does not relate to the context of being run by refugees.
• out: The word 'out' is an adverb that does not convey the meaning of being overwhelmed and does not fit grammatically.
• inside: The word 'inside' is a preposition that indicates location, which does not fit the context of being run by refugees.

Correct answer: out

Explanation: The word 'out' serves as an adverb that indicates removal or exclusion, fitting grammatically and contextually as it describes the action of dismissing the argument.

Meaning: 'Out' indicates the action of discarding or rejecting something, in this case, the argument about overpopulation.

Wrong options:

• other: The word 'other' does not fit as it does not convey the action of removal and is not an adverb.
• one: The word 'one' is a determiner that does not fit the context of describing the action of throwing something out.
• over: The word 'over' is a preposition that does not convey the meaning of exclusion or removal in this context.
• after: The word 'after' is a preposition that indicates time or sequence, which does not relate to the action of throwing out an argument.
• inside: The word 'inside' is a preposition that indicates location, which does not fit the context of discarding an argument.