The united states purchased alaska from russia because a of the large number of oil fields b of the aleutian island c of the gold fields in the yukon d of the fur trading industry

D i am pretty sure that is the best answer plus alaska was into fur

This would be an open primary. a closed primary people can vote only prior to election day if the party if they are registered. independent voters can not participate. there is not a wide-open primary, but there is a semi-open primary.