for mba marketing question

Which of the following statement correctly reflects the difference between the sales concept and the marketing concept? Select one:

a. The marketing concept focuses on providing the right product to the customer which involves creating, communicating and delivering value. The selling concept assumes the customers are not intrinsically interested in buying the product and have to be hard sold.

b. None of the others

c. In the marketing concept, it is assumed that the customer appreciates quality and variety. In the selling concept, it is assumed that the customer prefers the lowest-priced item.

d. In selling concept it is assumed that the customer prefers quality and variety while in the marketing concept the assumption is that the right product needs be provided to the customer which involves the creation, communication, and delivery of value.