The Balance Sheet Method Starts the Process of Smoothing Out

The balance sheet method starts the process of smoothing out cost-of-living and tax differences across countries by dividing expenses into what four basic categories?

A) Housing, income taxes, goods and services, and retirement
B) Housing, income taxes, goods and services, and savings reserve or discretionary component
C) Discretionary component, travel, goods and services, and retirement
D) Discretionary component, travel, goods and services, and income taxes