Answer:
Option D. is the right answer
Explanation:
John C Fremont, is an American explorer who had undertaken many expeditions, in which the second expedition describes his Oregon Trail.
He crossed the Sierra Nevada mountain range and entered California. He passed through Nebraska, Wyoming. Fur trade was a famous trade in Wyoming.
He traveled through a rugged terrain which was totally empty and uninteresting to look at. He reached Great Salt Lake where he collected plants and rock specimen. It was a 14 month mission which earned him the title ‘Pathfinder’.
