Answer:
The correct answer is letter "B": selling on non-price factors, such as design or customer service.
Explanation:
Product differentiation is a marketing tool used by companies to distinguish their products or services from the competition. Generally speaking, the more a product is distinguished and thus made exclusive, the higher the company's profit margin. The most common form of product differentiation includes emphasizing the quality of the goods or the customer service offered in contrast to the products in competition.