Final answer:
The opportunity cost of hiring additional Resource Writers in place of Flashcard Writers depends on the trade-off illustrated by the Production Possibility Frontier (PPF), which is not provided. Hence, the answer cannot be determined without the specific PPF curve detail.
Step-by-step explanation:
The concept of opportunity cost is central to understanding the Production Possibility Frontier (PPF), which graphically demonstrates the trade-offs between two options given limited resources. In the scenario provided, if Daniel has decided to hire 10 new Resource Writers instead of the 6 originally planned, the opportunity cost of his decision will depend on the trade-off ratio between hiring Resource Writers and Flashcard Writers. Without specific numbers provided by a PPF graph illustrating the exact trade-off between the two types of writers, the opportunity cost in terms of Flashcard Writers cannot be determined with the information given.
The PPF is a downward-sloping curve that shows the maximum possible production levels of two commodities that a business can achieve, given its resources. When resources are allocated to increase production of one good, there is a sacrifice in the production of the other good, which is the opportunity cost. If, for example, the slope of the PPF indicates a 1:1 trade-off, hiring 4 additional Resource Writers would mean forgoing the hiring of 4 Flashcard Writers, making option (a) the correct choice. However, a PPF is needed to give an exact answer.