In a Simple Economy, One Family May Produce Only Cooking

In a simple economy, one family may produce only cooking pots, but many of them. Others may specialize in farming, making clothing, and building shelters. This

A) shows why "discrepancies of assortment" occur.
B) is so simple that the universal functions of marketing don't have to be done.
C) cannot work without an intermediary.
D) is an example of "separation in values" since the different families choose to produce different things.