Answer:
The correct answer is option d.
Step-by-step explanation:
Choco Fantasy firm produces dark chocolates and liquor chocolates. If the firm is operating on its production possibility frontier it can increase the production of one good at a time. This is because of the scarcity of resources.
Resources are limited, so if we want to increase the production of one good we need to decrease the production of the other. That is why the shape of the frontier is downward sloping.
So even if the demand for both the goods has increased, the company can increase the production of only one of them.