What is the relationship between the success of miners and the location in which the gold-rush took place?
A Because of guidebooks and outfitters, it was easy to get to the gold-fields but there was not enough gold for everyone who arrived.
B The Yukon was difficult to find, so almost no one was able to get there alive and there were not enough people to mine the gold.
C Because the Yukon was cold, dangerous, and remote, mining there was difficult and unsuccessful.
D Mining was successful because there was plenty of gold to go around for those who survived the journey to the Yukon.