Answer:
The correct answer is letter "C": Economies of scope.
Step-by-step explanation:
Economies of scope is an economic theory that states an increase in the variety of goods produced results in a decrease in the average cost of production. This is in contrast to Economies of scale which focuses on average cost reduction by an increase in the volume of a single product.
With economies of scope, the focus is on better utilization of overhead and common assets. As these costs are spread over a greater variety of products, their average cost per unit of production declines.