Early urban societies could not have been maintained without large-scale farming nearby. This is because other methods of food acquisition, such as foraging, cannot support populations as dense as urban ones. Large-scale farming requires irrigation, which rivers or lakes until more recent times.
What this question is testing
Your task
Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.
Common trap
Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.
Winning move
Predict what a right answer must do, then test each choice against the conclusion-evidence gap.
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