One important characteristic of money is that it must be: A. made of some kind of metal.
B. available in limited amounts.
C. difficult to store and carry.
D. the same for all countries.​

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.

What the question i don't get it do u mean what she needs to do to auctually become one