Concept: A private business survives in the long run by satisfying its customers with good products.Explanation:• Exporting products is not the main factor because not all private businesses export.• Making more profits is important, but profits come from having customers who keep buying the products.• Paying less tax does not directly affect the continuous survival of the business.• Production of quality goods builds customer trust, attracts more buyers, and ensures continued demand for the business's products.Answer: D. production of quality goods.