The answer is d
Microeconomics examines the decision making undertaken by individual households, including their total household expenditures
Household spending is the most important part of aggregate demand and can be broken down into categories such as food, clothing, housing, energy, transport, durable goods, health costs, leisure, and miscellaneous services
The level of spending is determined by factors such as household income, relative prices, and unemployment
Microeconomic analysis of household expenditures can provide insight into the relationship between household expenditures and other economic factors, such as house prices