Who were the Mountain Men?

A. Mormon missionaries seeking to convert Indians in the Rockies

B. young American trappers and traders in the Rocky Mountains

C. expansionists who favored increased westward migration

D. men who led wagon trains on the Oregon Trail

Mountain Men young American trappers and traders in the Rocky Mountains.

Option (b);

Explanation:

Mountain men were a group of explorers who discovered the new immigrant trails that led to new territories. These inventions result in the motivation for trade and other commerce opportunities. They improved roads that allowed free movement of wagons that enables the Americans to settle in the West. Also, they organized wagons to facilitate easy transportation. Their main source of trade was fur which initially gave rise to their trade operation and functions that introduced new dealings lasted for nearly three decades.

Option b