Concept:The marketing concept is the business philosophy that treats the consumer as the most important focus, and aims to satisfy the consumer's needs.
Explanation:The phrase "the consumer is king" means the customer's needs and wants come first.
A business that uses the marketing concept first studies consumer needs, then produces goods and services to satisfy those needs better than competitors.
Market segmentation is simply dividing the market into different groups, while market research is gathering consumer information, but neither places the consumer in charge.
The marketing mix is the set of tools, such as product, price, place, and promotion, used to implement the marketing concept.
Therefore, the marketing term that regards the consumer as king is the marketing concept.
Answer:C. marketing concept