Explanation:

- Human capital refers to the knowledge, skills, abilities, and experience possessed by individuals that contribute to economic value creation.

- Human Resource is a broader term, often used to describe the workforce or employees of an organization, not specifically their ability to add value.

- Human capital formation is the process of improving human capital through education, health, and training.

- The correct term for the ability of humans to contribute to value addition in the economy is Human capital.

- None of these does not fit as other options are more precise.