One of the ______, the giant redwood tree Sequoia is one of the tallest tree species.

gymnosperms

The correct answer is Option (4) - Gymnosperms

One of the gymnosperms, the giant redwood tree Sequoia, is one of the tallest tree species. Gymnosperms are a group of seed-producing plants whose seeds are not enclosed within an ovary or fruit. They include various conifers, such as pines, spruces, firs, and cypresses, as well as the iconic redwood trees. The giant redwoods, including Sequoia sempervirens and Sequoiadendron giganteum, are renowned for their immense size and height, making them among the tallest trees on Earth.