Final answer:
The main ideals of conservation during Roosevelt's presidency included preservation of wilderness areas, wise and sustainable use of natural resources, and protection of public land.
Step-by-step explanation:
The main ideals of conservation during Roosevelt's presidency included the preservation of wilderness areas for future generations (A), the wise and sustainable use of natural resources (B), and the protection of public land (C).
Roosevelt believed in the importance of preserving lands and species for recreation and was influenced by naturalist John Muir.
He established national parks, wildlife refuges, and forest reserves to protect the environment and promote the long-term availability of resources.