Barter Requires a Double Coincidence of Wants

Barter requires a double coincidence of wants.This means that:

A) at least two traders must demand a commodity.
B) any two traders involved in a transaction must have money.
C) each trader must demand at least two commodities.
D) either of the two trades involved in a transaction must have money.
E) when two traders are involved in a transaction each trader must want what the other has to offer.