Why can markets develop in a river valley?

Correct answer: Because water, agricultural produce and transport facilities are available

The direct answer is B. Markets need both goods to exchange and ways to move people and goods. A river valley often provides water for people, animals, and some productive activities; fertile land can produce crops; and the valley or river corridor may support transport and communication. Farmers can bring grain, vegetables, or other products to a nearby market, while traders bring tools and consumer goods. Option B is correct because water, agricultural production, and transport together encourage trade and settlement. Option A is wrong because rivers do not destroy all resources; they often support many resources. Option C is wrong because rivers have many human uses, even though they must be managed safely. Option D is wrong because a river does not always provide mineral oil, and oil is not the basic reason markets develop there. Flood risk may require planning, but it does not remove the economic advantages. Memory cue: resources plus routes create markets.