Answer:
The correct answer is a. national income; goods and services
Explanation:
This is a relationship that we use in macroeconomics. Â
The IS curve describes the combinations of two variables , Â they are interest rate and the level of income, when the market of goods and services is in equilibrium. Â
So, Â The IS curve plots the relationship between the interest rate and national income that arises in the market for goods and services