The correct answer is: Blue Pine.
Blue Pine is a coniferous tree that is native to the Himalayas. It is a tall, slender tree with a dense crown of blue-green needles. Blue Pine is well adapted to the cold, dry climate of Ladakh and is an important source of timber and fuel for the local people.
Chir is a deciduous tree that is also native to the Himalayas. It is a smaller tree than Blue Pine with a less dense crown of green leaves. Chir is not as well adapted to the cold, dry climate of Ladakh as Blue Pine and is not as common in the region.
Willow is a deciduous tree that is found in many parts of the world. It is a fast-growing tree that can tolerate a wide range of climates. Willow is not native to Ladakh and is not commonly found in the region.
Deodar is a coniferous tree that is native to the Himalayas. It is a large, majestic tree with a dense crown of dark green needles. Deodar is well adapted to the cold, dry climate of Ladakh and is an important source of timber and fuel for the local people. However, Deodar is not as common in Ladakh as Blue Pine.