Answer:
The correct answer is the letter d. the quantity of goods and services households, firms, the government, and customer abroad want to buy.
Explanation:
Aggregate demand brings together the total expenditure on goods and services of the following economic agents in an economy: households, businesses, the government, and the external sector. Thus, aggregate demand represents the aggregate consumption of a given economy, ie the amount of goods and services consumed at a given time in a country.