The correct answer is: a) Tropical Evergreen.
Tropical evergreen forests are the most prevalent type of forest in Assam’s hill regions. They are characterized by their dense canopy of trees that remain green all year round. These forests are home to a wide variety of plant and animal life, including many species that are found nowhere else in the world.
Subtropical pine forests are also found in Assam, but they are not as common as tropical evergreen forests. These forests are characterized by their tall, needle-leaved pines. They are found at higher elevations than tropical evergreen forests, and they are less diverse in terms of plant and animal life.
Deciduous forests are not found in Assam. These forests are characterized by their trees that lose their leaves in the fall. They are found in temperate climates, and they are not found in the tropical climate of Assam.
Mangrove forests are also not found in Assam. These forests are found in coastal areas, and they are characterized by their trees that are adapted to living in salty water. They are not found in the inland hill regions of Assam.