Final answer:
The factor that would most likely shift the production possibilities curve inward is a natural disaster disrupting production.
Step-by-step explanation:
The factor that would most likely shift the production possibilities curve inward is D. Natural disaster disrupting production.
An inward shift of the production possibilities curve represents a decrease in an economy's ability to produce goods and services. A natural disaster, such as a hurricane, earthquake, or flood, can have a significant impact on a country's infrastructure, resources, and productivity, leading to a decrease in production capacity and a shift inward of the curve.
For example, a hurricane can destroy factories, disrupt transportation networks, and damage crops, causing a decrease in the quantity and quality of goods and services that can be produced in the affected area. This would result in a contraction of the production possibilities curve and a decrease in the potential output of the economy.