Option 1 states that the Rohtang tunnel is located at an altitude of 5,000 feet. This statement is incorrect. The Rohtang tunnel is actually located at an altitude of approximately 10,000 feet. The tunnel is being constructed in the Pir Panjal Range of the Himalayas in Himachal Pradesh, India.

Option 2 states that the tunnel will provide all-year connectivity to Lahaul and Spiti Valley. This statement is correct. Currently, the Lahaul and Spiti Valley region remains cut off from the rest of the country for six months due to heavy snowfall in the Rohtang Pass. However, once the tunnel is completed, it will ensure round-the-year connectivity to the region, benefiting the local population as well as facilitating tourism and trade.

Option 3 states that the tunnel is being built by the Border Roads Organization (BRO). This statement is correct. The BRO, which is responsible for the construction and maintenance of roads in border areas, is undertaking the construction of the Rohtang tunnel project.

Option 4 states that the tunnel will reduce the length of the Leh-Manali highway by approximately 50 km. This statement is correct. Upon completion, the tunnel will reduce the travel distance between Manali and