One of the commercially important trees of tropical rain forest is _______.

The correct option is D Mahogany.
Tropical rain forests are found in the regions where the annual rainfall is more than 200 cm with a short dry season. These forests are also called Topical evergreen forests.

In these forests, trees reach a great height up to 60 meters and above. Some of the commercially important trees of these forests are ebony, mahogany, rosewood, rubber, cinchona, lianas and bamboo.