Answer: (B) Personal selling
Step-by-step explanation:
The personal selling is one of the type of business strategy that is used for selling the products and the services to the customer or user face to face.
The importance of the personal selling is that it helps in maintain the relationship with the customer and also encourage the consumers for using the products.
Personal selling helps in build the trust with the users and also helps in taking various types of technical decisions regarding the products.
According to the given question, the A.Y. McDonald is one of the manufacturer of the pumps and the valves and the above given is an example personal selling.
Therefore, Option (B) is correct answer.