What was the Rendezvous and why was it important to the Mountain Men?

AIt was the largest trading company in the West and the Mountain Men traded their pelts to the company for supplies

BIt was a fort where the Mountain Men got supplies and meet and married Indian women

CIt was the largest Indian village in the West where the Mountain Men married Indian brides

DIt was where the Mountain Men traded beaver pelts for supplies and where they had fun and games