The correct answer is option 'C) Danes'.

The Danish were forced to sell all their settlements in India to the British.

Here's an explanation of this answer:

1. Danish Settlements in India:
- During the colonial period, several European powers had established settlements in various parts of India.
- The Danish were one of these European powers and they had established settlements in India, mainly in the regions of Tranquebar (now Tharangambadi) and Serampore (now in West Bengal).

2. British Expansion in India:
- The British East India Company, a powerful trading company, had been steadily expanding its influence and control over different parts of India.
- The British were engaged in conflicts and rivalries with other European powers, including the Dutch, Portuguese, French, and Danish, who also had settlements in India.

3. The Anglo-Danish Treaty of 1845:
- In the early 19th century, the Danish settlements in India were becoming increasingly vulnerable to British influence.
- In 1845, the Danish and British governments signed the Anglo-Danish Treaty, which resulted in the transfer of the Danish settlements to the British.
- According to the treaty, the Danish agreed to sell all their settlements in India to the British in exchange for a monetary compensation.

4. Reasons for the Danish Sale:
- There were several reasons why the Danish decided to sell their settlements to the British.
- The Danish settlements were small and economically weak compared to the expanding British presence in India.
- The Danish government also faced financial difficulties and saw the sale as an opportunity to raise funds.
- Additionally, the Danish settlements were geographically isolated and lacked the necessary resources to compete with the British.

5. Aftermath:
- Following the sale, the Danish settlements became part of British India.
- Tranquebar and Serampore, the former Danish colonies, were administered by the British East India Company and later by the British Crown.
- The British consolidated their control over these territories and incorporated them into their overall colonial administration.

In conclusion, the Danish were forced to sell all their settlements in India to the British due to the increasing British influence, the economic weakness of the Danish settlements, and the financial difficulties faced by the Danish government.