Final answer:
The largest opportunity cost for producing Good Y on a typical outward-bending Production Possibility Frontier (PPF) would be incurred in the transition from 15 to 20 units, (option d) as resources are usually most specialized at that point.
Step-by-step explanation:
Opportunity cost is a fundamental concept in economics that describes the cost of forgoing the next best alternative when making a decision. In the context of a Production Possibility Frontier (PPF), which represents the maximum combinations of two goods that a company can produce with its available resources, the opportunity cost of producing one good increases as you produce more of it if the PPF is bowed outward. This increasing opportunity cost is reflected in the concave shape of the PPF; hence, as more units of Good Y are produced, the quantity of Good X that must be given up increases. Based on this understanding, the interval involving the largest opportunity cost for producing Good Y would generally be from 15 to 20 units if we assume a typical outward-bending PPF, because it represents the production range where resources are most specialized in the production of Good X, and thus, diverting them to produce Good Y incurs a higher opportunity cost.