The correct answer is Only two pairs. Explanation & Key Takeaways: Bara-lacha Pass • It is a high mountain pass in Zanskar range, connecting Lahaul district in Himachal Pradesh to Leh district in Ladakh. The Leh–Manali Highway traverses the pass. Hence, pair 1 is correct. • The two headwaters of the Chenab River, Chandra and Bhaga, originate near the Baralacha Pass. • The Chandra originates from glacier in this region. The native name of Chenab, "Chandrabhaga", represents the union of Chandra and Bhaga rivers downstream. • The pass also acts as a water divide between the Bhaga river and the Yunam river. Palghat Pass • It is located between the Nilgiri Hills to the north and the Anaimalai Hills to the south. • It is about 32 km wide and straddles the Kerala–Tamil Nadu border, serving as a central communication route between those two states. • Palghat is a major break in southwestern India's Western Ghats mountain range. Hence, pair 2 is incorrect. • Palghat Gap also influences southern India’s climate; the wet southwest monsoons as well as storms from the Bay of Bengal cross the mountains through the opening. Haldighati • It is a mountain pass between Khamnore and Balicha village situated at Aravalli Range of Rajsamand district in Rajasthan, India which connects Rajsamand city and Udaipur city. Hence, pair 3 is incorrect. • The pass is located at a distance of 44 kilometres from Udaipur. • The name 'Haldighati' is believed to have originated from the turmeric-coloured yellow soil of the area. Diphu Pass • It is a mountain pass around the area of the disputed tri-point borders of India, China, and Myanmar. • Diphu Pass is also a strategic approach to eastern Arunachal Pradesh in India. Hence, pair 4 is correct. • It lies on the McMahon Line. It is located in Anjaw district of Arunachal Pradesh, 120 km northeast of district headquarter at Hawai via the Hawai-Walong-Dong-Kibithu-Kaho-Dhipu Pass route. • It is located around the area of the disputed tri-point borders of India, Myanmar, and China