Mechanized farming techniques are well-suited to geographic areas that
a) have a shortage of inexpensive labor.
b) are closer to major urban areas.
c) have large expanses of flat land
d) experience frequent flooding

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.