Read this excerpt from "The Spirit of Alcatraz."
As the months passed, the occupation began to lose some of its momentum, and several occupiers left the island to return to school or family life. Things became more difficult when the government cut off phone service to the island, followed by electrical power and fresh water.
Finally, on June 11, 1971, a large force of government agents arrived on Alcatraz and removed the last fifteen people – six men, four women, and five children. After nineteen months, the occupation was over.
Which word best describes the tone of this excerpt?
casual
scientific
humorous
factual