Explanation:

- Factors of Production:

- Land: Natural resources available for production, like forests and minerals.

- Labour: Human effort used in production processes.

- Capital: Machinery, tools, and buildings used in production.

- Enterprise: The risk-taking and management ability necessary to coordinate the other factors.

- Options:

- Enterprise: The right answer, as it refers to the entrepreneurial skills needed for production.

- Investment: Use of capital in projects. It's linked to capital rather than being a standalone factor.

- Machinery: A type of capital.

- Resources: A broader term that often includes land and raw materials, not a separate production factor.