One method used to demonstrate the reversibility of the effect of the independent variable is a(n) :

A) quasi-experimental design.
B) interrupted time series design.
C) control series design.
D) ABA design.

The ABA design (also known as withdrawal or reversal design) involves an initial baseline phase (A), followed by the introduction of the independent variable (B), and then the removal of the independent variable to return to the baseline phase (A). This design is used to demonstrate the reversibility of the effect of the independent variable by showing that changes in the dependent variable occur during the introduction of the independent variable (B phase) and then return to baseline levels when the independent variable is removed (A phase).