River Luni drains into:
Option 3 is the right answer.
River Luni lies in state Rajsthan , it originates in the Pushkar Valley near Ajmer and ends in the Run of Kutch in Gujrat after travelling the distance of 495 km.
The Luni River basin is 37,363 km², which includes all or part of Ajmer, Barmer, Jalor, Jodhpur, Nagaur, Pali, and Sirohi districts of Rajasthan Mithavirana, Jordiyali, Mavsari Vav, Radhanpur region of Banaskantha North Gujarat. Its major tributaries are the Sukri, Mithri, Bandi, Khari, Jawai, Guhiya and Sagi from the left, and the Jojari River from the right
It is also known as Lavanavati river. It means “Salt River” in Sanskrit, due high salinity of its water.