The main purpose of a political boundary is to a. encourage conflict between neighboring states b. dictate limitations on the influence of a government c. overcome physical features in order to increase population growth d. track small boundary changes caused by physical features

answer; i believe the correct answer is (general);

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.