Explanation:

- The Kangsabati Kumari Dam is not built on the Ganga (Option 1). The Ganga is a major river in India, but the Kangsabati Dam is unrelated to it.

- The Damodar (Option 2) is known for several dams, but Kangsabati is not one of them.

- Option 3, Kasi, is incorrect. There is no major river by this name connected to the Kangsabati Dam.

- The Subarnarekha (Option 4) flows through eastern India but does not have the Kangsabati Kumari Dam built on it.

- The correct answer is that the Kangsabati Kumari Dam is built on the Kangsabati River. None of the given options directly mention "Kangsabati," but if these are the only choices, then none are correct.