the primary difference between the aggregate demand curve and anindividual demand curve is that:

a. The aggregate demand curve represents total plannedexpenditures on all goods and services while an individual demandcurve represents a signle good or service.

b. a change in real balances will shift an individual demandcurve but not the aggregate demand curve.

c. a change in the price level will shift the aggregate demandcurve but not an individual demand curve.