When Examining the Relationship Between the Rates of Growth of Health

When examining the relationship between the rates of growth of health expenditures and GDP in order to build a model for forecasting healthcare expenditures, the most precise estimate would come from using __________ as an independent variable.

A) year-to-year changes in GDP.
B) averaged GDP rates of growth over the 3-year periods.
C) averaged GDP rates of growth over the 5-year periods.
D) averaged GDP rates of growth over the 8-year periods.
E) averaged GDP rates of growth over the 10-year periods.