Captain Holroyd was a British officer tasked with:

The correct answer is: a) Investigating rebels in Assam.

Captain Holroyd was a British officer who was tasked with investigating rebels in Assam. He was sent to Assam in 1824 to investigate the causes of the rebellion and to recommend solutions. He found that the rebels were unhappy with British rule and that they were being exploited by British officials. He recommended that the British government make changes to its policies in Assam in order to improve the lives of the people and to prevent further rebellions.

The other options are incorrect because:

• Option b) is incorrect because Captain Holroyd was not tasked with negotiating peace with local leaders. He was tasked with investigating rebels.
• Option c) is incorrect because Captain Holroyd was not tasked with raising new loyalist regiments. He was tasked with investigating rebels.
• Option d) is incorrect because Captain Holroyd was not tasked with defending against invading forces. He was tasked with investigating rebels.