Correct Answer:
B. Mines & minerals
The correct answer is Mines & minerals. It is a fundamental principle in many land administration laws that the government retains sovereign rights over all mines and minerals found in or under any land, regardless of surface ownership or tenancy. This ensures state control over valuable natural resources. Distractors like 'Water' are incorrect because while water rights are regulated, the government doesn't reserve 'all' water in the same absolute sense. 'Timber & forests' are generally reserved on government lands, but not universally on all lands. 'Buildings' are typically private property of the landowner.