It would be the journal written by Christopher Columbus. (even though he didn't actually discover the new world, so he shouldn't get credit for it... but that's how it's taught in history.)
The Last of the Mohicans is set in 1757, during the French and Indian War (the Seven Years' War), when France and Great Britain battled for control of North America
The answer to your question is:
C. Were dirty, crowded, and unhealthy.
