The sentences that use commas correctly is A) Volcanoes spew molten rock and, mostly exist along the Pacific Rim.
The answer is imperialism. Imperialism is <span>a policy of extending a country's power and influence through diplomacy or military force.</span>
President Roosevelt preferred to combine conservation with the use of public land for its resources.
<u>Explanation:</u>
The president Roosevelt formed an authority to protect the forest and natural resources which was United States forest service. During the time of The president Roosevelt, the conservationists got power to protect the natural resources and the forests.
He formed an authority to take care of the forest which was the United States forest service where people worked together to protect the forest. Along with that 150 national forests, 51 bird reserves and national game preserves were also established. He also tried to bring an end to wasteful use of raw material and conserve and protect other natural resources.
The answer is A hope it helps
