Final answer:
The Sierra redwood referred to in the question is the Giant Sequoia or Sequoiadendron giganteum, answer choice A) Sequoia.
Step-by-step explanation:
The correct answer to the question is A) Sequoia. The Sierra redwood that lends its name to a forest in California, with over 30 groves, is the Giant Sequoia or Giant Redwood. Specifically, this refers to the species known as Sequoiadendron giganteum. These trees are found in the western slopes of the Sierra Nevada mountains and have a number of adaptations that allow them to thrive in fire-prone areas. In comparison to the Coast Redwood (Sequoia sempervirens), which is taller and thinner, the Giant Sequoias are known for their massive volume and are the largest trees in the world by volume.