Explanation:
The correctly matched pairs are:
(1) Ramosi rising - Chittur Singh
(2) Santhal rising - Birsa Munda

Ramosi Rising and Chittur Singh:
- The Ramosi uprising took place in the 1820s in the region of Satara in Maharashtra.
- The leader of the revolt was Chittur Singh, a member of the Ramosi tribe.
- The uprising was a peasant rebellion against the oppressive British colonial policies, including the imposition of heavy taxes and the confiscation of land.
- Chittur Singh led a group of rebels who fought against the British forces.
- However, the revolt was eventually suppressed by the British, and Chittur Singh was captured and executed.

Santhal Rising and Birsa Munda:
- The Santhal uprising, also known as the Santhal Rebellion, took place in the 1850s in the present-day states of Jharkhand, West Bengal, and Bihar.
- The leader of the revolt was Birsa Munda, a Santhal tribal leader.
- The Santhals, who were an indigenous tribal community, revolted against the oppressive policies of the British administration, including the exploitation of their land and resources.
- Birsa Munda led the Santhals in a series of attacks on colonial infrastructure, such as railways and telegraph lines.
- The rebellion was eventually crushed by the British, and Birsa Munda was arrested and died in prison.

Satara Revolt and Dhar Rao:
- The Satara revolt refers to the rebellion against the British East India Company's annexation of the Maratha kingdom of Satara in 1848.
- However, the leader of the revolt was not Dhar Rao, but it was Dhondu Pant, also known as Nana Sahib.
- Dhar Rao was the last ruler of the Maratha kingdom of Satara, but he did not lead the revolt.
- The revolt was a response to the annexation of Satara and the deposition of Dhar Rao as the ruler.
- The rebellion was unsuccessful, and the British maintained control over the region.

Conclusion:
From the given options, only the pair of Ramosi rising and Chittur Singh, and the pair of Santhal rising and Birsa Munda are correctly matched. The Satara revolt was not led by Dhar Rao, but by Dhondu Pant. Therefore, option B is the correct answer.