Detailed Explanation:

Major General Charles Napier led the British military campaign that conquered and annexed Sindh in 1843. Following victories at battles of Miani and Hyderabad against the Sindhi Amirs, the entire territory was annexed to the Bombay Presidency.

Sleeman was known for suppressing the Thuggee movement, Lawrence for administering Punjab, and Wellington for defeating Tipu Sultan and later Napoleon—none were involved in Sindh's annexation.

Therefore, Napier conquered Sindh, making Option 2 the correct answer.