Explanation:

- Physical capital refers to man-made tools, machines, buildings, and other means of production necessary for creating further goods and services.

- Human capital is the skills, knowledge, and experience possessed by individuals, which contribute to productivity but are not tangible assets like physical machines.

- Financial capital represents funds available for use in production or investment, such as money and other financial resources. It is not directly part of the physical means of production.

- None of the above does not apply as an answer because physical capital correctly fills the blank by definition.

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