Considering an economic system, converting products made by producers into varieties sought by consumers is the role of
a. factory supervisors
b. upstream partners
c. third-party logistics
d. marketing intermediaries
e. price consultants

(D) Marketing intermediaries

Explanation:

 The marketing intermediaries is basically refers to the supply chain between the producer and the various types of end users or consumers that linked both of them and also know  as the distribution intermediaries.

 The main function of the marketing intermediaries is that it helps in establishing a relationship between the retailer and the producer.

The following are the different types of marketing intermediaries are as follows:

 Therefore, Option (D) is correct answer.