The correct answer is: Bara-lacha La Pass.
The Manali-Leh Highway is a high-altitude mountain road in the Indian state of Himachal Pradesh. It connects the town of Manali with the city of Leh in Ladakh. The highway is 476 km long and is one of the highest motorable roads in the world. The highway passes through the Rohtang Pass (3978 m), the Kunzum Pass (4551 m), and the Bara-lacha La Pass (4892 m).
The Bara-lacha La Pass is the highest point on the Manali-Leh Highway. It is located in the Zanskar Range of the Himalayas. The pass is open from June to September. The pass is a popular tourist destination.
The other options are incorrect because they are not mountain passes on the Manali-Leh Highway.
- Fotu La Pass is a mountain pass in the Pir Panjal Range of the Himalayas. It is located in the Kullu district of Himachal Pradesh. The pass is open from May to October.
- Shingo La Pass is a mountain pass in the Zanskar Range of the Himalayas. It is located in the Leh district of Ladakh. The pass is open from June to September.
- Lachulung La Pass is a mountain pass in the Ladakh Range of the Himalayas. It is located in the Leh district of Ladakh. The pass is open from June to September.