In Europe during the 14th century, the Black Plague killed 24 million people or close to 37 percent of the population. How would this affect the production possibilities curves for the countries of Europe at that time?

a. The production possibilities curves for these countries would have shifted outward.
b. This would have been illustrated by a movement along the production possibilities curves for these countries, but it would not have shifted them.
c. The production possibilities curves for these countries would have been unaffected.
d.  The production possibilities curves for these countries would have shifted inward.

d.  The production possibilities curves for these countries would have shifted inward.