Answer: C.
Step-by-step explanation:
c. Customers are not a factor of production.
The factors of production are the resources that are used in the production of goods and services. The four main factors of production are land, labor, capital, and entrepreneurship.
a. Dairy cattle are a type of land resource used in agriculture and food production.
b. Coal miners are labor resources used in the extraction and production of coal.
d. Trucks are capital resources used in transportation and logistics.
Customers are not considered a factor of production because they are not resources used in the production process. Customers are the end-users or consumers of goods and services produced by the factors of production.