How did John C. Frmont's 1845 published account of his explorations with the Army Topological Corps ...

How did John C. Frmont's 1845 published account of his explorations with the Army Topological Corps affect Americans' attitudes about the West?
 
  A) Stories about hostile Indian attacks frightened many potential settlers from traveling to the
  West.
  B) The adventures of American fur trappers gloried life in the West for many Americans.
  C) Explanations about the harsh weather conditions, including freezing winter blizzards and
  summer droughts, convinced settlers that the West was not suitable for habitation.
  D) The myth of the Great American Desert was dispelled with evidence that the Great Plains
  were a fertile area for settlement.