The correct answer is C. Thalassery Fort.
The Thalassery uprising was a rebellion against the British East India Company that took place in the Malabar region of India in 1766. The uprising was led by Pazhassi Raja, a local ruler who opposed the Company’s expansion into his territory. The uprising was initially successful, and the British were forced to retreat from Thalassery Fort. However, the Company eventually regrouped and defeated the rebels. Pazhassi Raja was killed in battle in 1775, and the uprising was suppressed.
The Thalassery uprising was a significant event in the history of British India. It was one of the first major challenges to the Company’s authority in the region, and it showed that the Company was not invincible. The uprising also led to a change in the Company’s policy towards the Malabar region. In the aftermath of the uprising, the Company became more cautious in its dealings with local rulers, and it made efforts to win their support.
The other options are incorrect because they are not forts that were captured by the rebels during the Thalassery uprising. Fort Kochi, Bekal Fort, and Anchuthengu Fort were all under British control during the uprising.