How did mountain men and fur traders help to promote western expansion? A) They proved the wilderness to be insurpassable.

B) They established an allegiance between the colonists and the Native Americans.

C) They proved that America's wilderness was inhabitable.

D) They provided sufficient clothing for westward travelers.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

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