The Biggest Disadvantage of a Barter System Compared to One

The biggest disadvantage of a barter system compared to one that uses money is that

A) it is difficult to find goods to trade in a barter system that satisfy the needs of society.
B) a standardized unit of account cannot exist in a barter system.
C) commodities are difficult to use as a store of value.
D) each trade requires a double coincidence of wants.
E) commodities are difficult to transport and therefore inefficient for exchange.