The Concept of Double Coincidence of Wants Refers to the Fact

The concept of double coincidence of wants refers to the fact that:

A) for a financial asset to be exchanged, it needs to be priced correctly.
B) for barter to take place, both parties have to want what the other party has.
C) people can never exactly agree on an equilibrium price.
D) different people value goods differently.
E) for barter to take place, both parties must have equal quantities of the same good.