Explanation: The passage mentions zamindars who lived in areas that the Mughal authorities found “inconvenient” to travel to in order to collect revenue. As the passage notes, these places, such as Raiputana, were anomalous (uncommon), so eliminate (D). The passage does not indicate that tax collection was the only source of revenue, so get rid of (C). Nor is there any mention of whether other religions had to pay taxes or not. Eliminate (A).