When Europeans Began to Use Their Colonies to Produce Crops

When Europeans began to use their colonies to produce crops for export ("cash crops") ,the usual result was

A) not very favorable, as people back in Europe spurned foods grown in African soil.
B) an economic disaster, because native peoples would from that time on be subject to the world economy.
C) a rising standard of living for such colonies.
D) a period of stagnation, after which the British led the way of conquering Africa.
E) None of the options are correct.