Answer:
The correct answer is option b.
Explanation:
The opportunity cost of any economic decision is the cost involved in sacrificing the next best alternative. We know that resources are scarce and have alternative uses. To increase the production of one good we need to decrease or give up production of its alternative.
As we go on the production of one good the marginal opportunity cost will go on increasing. This is because of resources are not perfectly substitutable for both goods. So as we go on increasing production of one good we need to sacrifice producing more and more of the other good.