The Yukon lay a mile wide and hidden under three feet of ice. On top of this ice were as many feet of snow. It was all pure white, rolling in gentle undulations where the ice jams of the freeze-up had formed. North and south, as far as his eye could see, it was unbroken white, save for a dark hairline that curved and twisted from around the spruce-covered island to the south, and that curved and twisted away into the north, where it disappeared behind another spruce-covered island. –“To Build a Fire,”
Jack London

Which facts about the Yukon gold rush connect to the ideas in this excerpt from “To Build a Fire”? Check all that apply.

Prospectors traveled along the Yukon River.
Winters in the Yukon were snowy.
Some prospectors died from the cold.
The gold rush started in 1897.
The Yukon territory was sparsely populated.