The correct answer is: a) Tropical evergreen.
Arunachal Pradesh is a state in northeastern India. It is the largest state in India by area, and it is home to a diverse range of plant and animal life. The most dominant type of forest in Arunachal Pradesh is tropical evergreen forest. Tropical evergreen forests are found in areas with warm, humid climates. They are characterized by a dense canopy of trees that are evergreen, meaning that they keep their leaves all year round. Tropical evergreen forests are home to a wide variety of plants and animals, including many species that are found nowhere else in the world.
The other options are incorrect because they do not describe the most dominant type of forest in Arunachal Pradesh. Tropical deciduous forests are found in areas with a more seasonal climate. They are characterized by trees that lose their leaves during the dry season. Subtropical pine forests are found in areas with a cooler climate. They are characterized by pines, which are coniferous trees that have needles instead of leaves. Temperate coniferous forests are found in areas with a cold climate. They are characterized by pines, firs, and other coniferous trees.