Answer: (B) Space travel offers a unique view of Earth.
Explanation: The main idea of “Single room, Earth View” was to describe Sally’s trips around the world in a space ship, specifically from her perspective of surface earth from space. The story is about America’s first woman in space, she describes the beauty of Earth from orbit. The story emphasizes how you can’t really describe space travel to someone who has never done it, it is difficult to describe an airplane ride to someone who has never flown. The tone of the story is descriptive.