The correct answer is: a) Tropical evergreen forests.
Tropical evergreen forests are the most common type of forest in Arunachal Pradesh. They are found in the lowlands and foothills of the state. These forests are characterized by their dense canopy of trees that are evergreen, meaning they keep their leaves all year round. The trees in these forests are tall and broad-leaved, and they provide a home for a variety of animals, including elephants, tigers, and monkeys.
Deciduous forests are found in the higher elevations of Arunachal Pradesh. These forests are characterized by their trees that lose their leaves in the winter. The trees in these forests are smaller than the trees in the tropical evergreen forests, and they provide a home for a variety of animals, including deer, leopards, and birds.
Coniferous forests are not found in Arunachal Pradesh. These forests are found in the northern hemisphere, and they are characterized by their trees that have needles instead of leaves. The trees in these forests are tall and slender, and they provide a home for a variety of animals, including squirrels, bears, and wolves.
Mangrove forests are also not found in Arunachal Pradesh. These forests are found in tropical and subtropical coastal areas, and they are characterized by their trees that are adapted to living in salty water. The trees in these forests are tall and slender, and they provide a home for a variety of animals, including crabs, shrimp, and fish.