Final answer:
The opportunity cost of producing the second unit of apple is 2 oranges.
Step-by-step explanation:
The opportunity cost of producing the second unit of apple is 2 oranges.
Opportunity cost is the value of the next best alternative that is forgone when making a choice. In this case, the opportunity cost of producing the second unit of apple would be the number of oranges that must be given up to produce it.
According to the information provided, the opportunity cost of the first unit of apple is 1 orange, the opportunity cost of the second unit of apple is 2 oranges. Therefore, the correct answer is option B. 2 oranges.