Capital, as a factor of production, is created primarily through the process of investment and the accumulation of resources that will be used to produce goods and services. Among the options provided, the best choice that reflects the creation of capital is:
D. By using labor to create services.
While capital can also be created through various means, including the application of human labor to enhance or improve physical assets (like buildings, machinery, and tools), the key idea is that labor contributes to the production and development of resources that are classified as capital.