Answer:
The correct answer is: C. Personal selling
Step-by-step explanation:
The personal sale is a tool of the promotional mix or type of sale where a particular seller offers, promotes or sells a product or service to a particular individual consumer directly.
It is based on a personal communication since it goes from one person (the seller) to another person (the potential customer or buyer), unlike for example advertising, which uses impersonal means since it is addressed to several consumers at the same time.
Personal selling is the most effective way to sell a product and to get a satisfied customer with the possibility that he can repeat the purchase or recommend the product or the company to other consumers.