Which two main factors drive changes in the U.S. production possibilities?

The correct answer highlights the critical role of technology and the number of workers in determining a country's production possibilities. Production possibilities refer to the maximum output that an economy can achieve when all resources are fully and efficiently utilized.

Technological advancements can significantly enhance productivity by allowing workers to produce more goods and services using the same amount of labor and resources. For instance, the introduction of more efficient machinery or improved production processes can shift the production possibilities frontier, enabling higher output levels without necessarily increasing the quantity of labor or raw materials.

The number of workers is equally important, as a larger labor force can contribute to increased production capacity. An increase in the workforce can arise from population growth, immigration, or higher participation rates in the labor market. More workers can lead to greater levels of output, assuming that these workers are effectively utilized and that there are sufficient resources to support them.

In summary, the interaction between advancing technology and changes in the workforce directly influences the capacity of the economy to produce goods and services, which is why this option captures the essence of the factors that drive changes in U.S. production possibilities.