Which of the Following Best Characterizes What an Aggregate Demand

Multiple Choice

Which of the following best characterizes what an aggregate demand curve depicts?  

A)  the quantity of goods and services demanded during a given time period at different interest rates, other things held constant 
B)  the final quantity of goods and services actually produced by the economy during a given time period, other things held constant 
C)  the quantity of goods and services demanded at different price levels during a given time period, other things held constant 
D)  the quantity of goods and services that the economy is capable of producing during a given time period, other things held constant