Step 1: Understanding the question.
The question is asking about the location where the first revolt against the British (also known as the Indian Rebellion of 1857) began on the afternoon of 10th May 1857.
Step 2: Historical context.
The Indian Rebellion of 1857, also called the Sepoy Mutiny, started in Meerut, where Indian soldiers (sepoys) rebelled against the British East India Company.
Step 3: Analysis of the options.
• (A) Delhi: Incorrect. While Delhi was an important location in the rebellion, the initial revolt began in Meerut.
• (B) Meerut: Correct. The rebellion started in Meerut when Indian soldiers revolted, which later spread to other parts of India, including Delhi.
• (C) Barrackpur: Incorrect. Barrackpur was another location of unrest, but it was not the place where the 1857 revolt began.
• (D) Ambala: Incorrect. Ambala did not witness the initial rebellion, although it had some later significance.
Step 4: Conclusion.
The correct answer is (B) Meerut, where the first rebellion against British rule began on 10th May 1857.
Final Answer: Meerut.