By timeline, 8500 BC was before 5000 BC. So sentence C is likely to feature after sentence D in the paragraph. Sentence D talks of cultivation of plants and domestication of animals that began in the Near East around 8500 BC. Sentence A carries this idea forward, explaining how fixed settlements and small towns came into being after people turned to farming. Sentence B starts off with “their labors”. Who does “their” refer to? Sentence C, which talks of farmers who moved down to the river valleys of Mesopotamia and their efforts to build dykes and ditches, has the answer. So B follows C. DACB makes a cogent paragraph. Correct Answer: DACB
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