In the following examples, who is functioning as a producer?
O
A. Beatrice, who is studying the interactions between two groups of
people
O
B. Conrad, who is reading reports written by conflict theorists
O
C. Leyla, who is shopping for supplies that she will donate to a local
charity
O
D. Thornstan, who is writing a book that will be sold in bookstores
around the world

D. Thornstan, who is writing a book that will be sold in bookstores

around the world

Explanation:

To be considered as a producer in the market, you need to transform a certain type of raw material into something that other people can consume/enjoy.

In Thornstan case, The blank paper, the ink, and his original ideas are what considered to be the 'Raw Materials'. He transformed those materials into a book with interesting contents for the buyers to consume/enjoy.