Correct option is D
The first sentence (P) states that the main source of water for Wular Lake is River Jhelum, which sets the context for the rest of the paragraph.
• The second sentence (R) introduces an interesting feature of the lake, which is a small island called ‘Zaina Lank’ located at its centre.
• The third sentence (S) provides further information about the island and states that it was constructed by King Zainul-Abi-Din.
• The last sentence (Q) concludes the paragraph by stating that Wular Lake is believed to be a remnant of Satisar Lake that existed in ancient times, providing a historical background of the lake.
• Therefore, the correct order of the sentences is PRSQ.