Answer:
Option "D" is the correct answer to the following question.
Step-by-step explanation:
If two countries produce two items separately or produce both goods simultaneously, then the opportunity cost of both those goods are opposite to each other.
In the given question, Korea is capable of producing shoes or football i.e the opportunity cost of shoes will be inverse of the opportunity cost of football or the opportunity cost of football will be inverse as the opportunity cost of the shoes because the country is capable of producing either item or can form a balanced mixture of both.