The correct answer is: a) Hollong
Hollong (Dipterocarpus macrocarpus) is a large, evergreen tree that is commonly found in the evergreen forests of Arunachal Pradesh. It is the state tree of Arunachal Pradesh. The tree is known for its beautiful flowers and its timber, which is used to make furniture, construction materials, and paper.
Sal (Shorea robusta) is a large, deciduous tree that is found in the tropical and subtropical forests of India, Bangladesh, and Myanmar. It is the national tree of India. The tree is known for its timber, which is used to make furniture, construction materials, and paper.
Deodar (Cedrus deodara) is a large, coniferous tree that is found in the Himalayas. It is the national tree of Pakistan. The tree is known for its timber, which is used to make furniture, construction materials, and paper.
Chir Pine (Pinus roxburghii) is a large, coniferous tree that is found in the Himalayas. It is the national tree of Nepal. The tree is known for its timber, which is used to make furniture, construction materials, and paper.