Concept:Vegetables are mostly water and are grown all year round, often in the dry season, so they need a steady and reliable water supply.Explanation:Without water for regular watering or irrigation, vegetables wilt and fail however much labour, market or pest control there is. That is why vegetable farms are sited near a river, stream, dam or well.Labour, nearness to market and pests matter, but less than water.Answer:Option C (Source of water)