Because Every Transaction Has a Buyer and a Seller

Multiple Choice

Because every transaction has a buyer and a seller,

A) GDP is more closely associated with a nation's income than it is with a nation's expenditure.
B) every transaction contributes equally to an economy's income and to its expenditure.
C) the number of firms must be equal to the number of households in a simple circular-flow diagram.
D) firms' profits are necessarily zero in a simple circular-flow diagram.