The Atal Tunnel, recognized as the world's longest highway tunnel, is situated within the Pir Panjal range of the Himalayas. This tunnel facilitates a connection between Manali and the Lahaul-Spiti Valley in Himachal Pradesh. It ensures continuous access to the region throughout the year, even during severe winter conditions when heavy snowfall typically renders the roads impassable.Therefore, the correct option is (A) Pir Panjal.