Answer:
The correct answer is option d.
Explanation:
Suppose an economy always produces on its production possibilities frontier.
Last year it was producing 50 units of food and 30 machines.
This year the economy experiences a technological advancement in the machine-building industry.
The society this year wants to produce 55 units of food and 30 machines.
Technological advancement implies that more output can be produced using the same level of resources or same level of output require fewer resources.
Since society wants to produce the same level of machines it will need fewer resources to do so. The excessive resources left can be used to produce 55 units of food.