One Can First-Difference Panel Data in a Two-Period Model by Subtracting

Multiple Choice

One can first-difference panel data in a two-period model by subtracting

A) the previous-period observation from the current-period observation for the dependent variable.
B) the previous-period observation from the current-period observation for the dependent variable and each independent variable.
C) the current-period observation from the previous-period observation for the dependent variable and each independent variable.
D) the current-period observation from the previous-period observation for the independent variable.