Question："A set of controllable variables that marketing managers have at their disposal to affect the sales and fortunes of each of the company's products."
　　Which element of marketing does this statement describe?
　　A. Marketing research.
　　B. Marketing segmentation.
　　C. Marketing orientation.
　　D. Marketing mix.
　　The correct answer is: Marketing mix.
　　解析：The traditional marketing mix includes four variables (4 Ps): product, price, place and promotion but for services, the marketing mix is extended to include 7 Ps: product, price, place, promotion, people, processes and physical evidence.