Answer:
b. PPF after the war has probably shifted to the left compared to its PPF prior to the war.
Step-by-step explanation:
When a country's production possibilities frontier shifts to the left, it means that the country's ability to produce goods and services decreases. In this case, the decrease is caused by a war that destroyed many of the country's factories and killed a lot of people. Factories and labor are factors of production, capital and labor respectively, and the less factors of production available, the less the total production.