The marketing variable that is concerned with design, quality, and packaging is product. Thus, option (D) is correct.
Marketing refers to those activities which helps in the selling of the goods and services. It is the concept which starts with the creation of the idea for the fulfillment of the needs of the products. It is ending with receiving the feedback and satisfaction of the customers.
Marketing involves various activities such as product design, promotional activities, market research, quality check, distribution channels and satisfaction of the needs of the customers.
Therefore, it can be concluded that designing of the product and providing it with the optimum quality and attractive packaging is concerned with product variable of marketing mix. Hence, option (D) is correct.
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