An argument for is that this may be a more efficient way of maintaining and growing a business than just trying to attract new customers.

Relationship marketing.

Explanation:

A marketing mix is made up of the four (4) Ps;

1. Products: this is typically the goods and services that gives satisfaction to the customer's needs and wants. They are either tangible or intangible items.

2. Price: this represents the amount of money a customer buying goods and services are willing to pay for it.

3. Place: this represents the areas of distribution of these goods and services for easier access by the potential customers.

4. Promotions: for a good sales record or in order to increase the number of people buying a product and taking services, it is very important to have a good marketing communication such as advertising, sales promotion, direct marketing etc.

Relationship marketing is more focused on providing satisfaction to the customers of a business firm, as well as retention of customers in the long-run.

An argument for relationship marketing is that, this may be a more efficient way of maintaining and growing a business than just trying to attract new customers.

Hence, the main purpose of relationship marketing is to achieve substantial level of customer satisfaction as well as using the organization's limited financial resources efficiently in order to boost the effective promotion and sales of its products.

b is the correct answer