参考答案

正确答案：D
解析：答案在第一段第一句话“Most economists believe that advertising has a positive impact on the economy because it stimulates demand for products and services, strengthening the economy by promoting the sale of goods and services.”意为“大部分经济学家认为广告对于经济有积极的影响，因为广告刺激了对于产品和服务的需要，并通过对商品和服务进行促销加强了经济。”A和C选项都提到了，所以选择D。