Answer:
The statement that best explains how Kennedy's words influenced the tone of the passage is:
Kennedy's tone was one of authority; he believed other nations, such as the Soviet Union, would use space as another way to wage war, whereas America would use the knowledge gained for peace and advancement of humanity.
In the passage, Kennedy expresses a strong sense of authority and a clear vision for the role of the United States in space exploration. He contrasts this vision with the potential actions of other nations, emphasizing America's commitment to the peaceful and knowledge-driven use of space.