The population is increasing and _________________ we need more food.
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so
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therefore
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then
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since
Reveal answer
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B
Correct answer
Explanation
'Therefore' shows a logical consequence or result. The increasing population causes the need for more food. 'So' is less formal, 'then' suggests sequence in time, and 'since' introduces a reason (used at the start, not mid-sentence in this structure).
AI explanation
'Therefore' is a conjunctive adverb that shows a logical result or consequence, fitting neatly between a cause (population increasing) and its effect (needing more food). 'So' could work informally but 'therefore' is the more precise, standard choice for this cause-and-effect structure in formal English usage tests, and 'then' or 'since' don't logically link the two clauses the same way.