The Rendezvous was a key event and location for mountain men in the 19th century, particularly during the fur trade era. It was a gathering point where trappers and mountain men would come together to trade fur, supplies, and goods.
The correct answer to your question is: **it was where the mountain men traded**.
During the Rendezvous, which typically took place annually in the Rocky Mountains, mountain men exchanged furs with traders, replenished their supplies, and socialized with each other and Native American tribes. This event was crucial for the mountain men because it was a vital economic and social hub that allowed for the continuation of their trade and lifestyle.