What Does the Aggregate Supply Curve Indicate

Multiple Choice

What does the aggregate supply curve indicate?  

A)  the quantity of aggregate output that producers are willing and able to supply at each possible price level 
B)  the total quantity of a particular good that all producers are willing to supply at each possible price level 
C)  the total quantity of a particular good that all producers are willing to supply at the equilibrium price level 
D)  the quantity of aggregate output that producers are willing and able to supply at the equilibrium price level