Which of the following best describes the logic used in the Pretest-Posttest with Control Group experimental design that allows this design to be a true experimental design?

A) The experimental group change (O2 - O1) contains the change in the independent variable due to the dependent variable and extraneous variables. When we subtract from this the control group (O4 - O3), which is the change due to the extraneous variables, we are left with the change due solely to the dependent variable.
B) The experimental group change (O2 - O1) contains the change in the complex variable due to the dependent variable and extraneous variables. When we subtract from this the control group (O4 - O3), which is the change due to the extraneous variables, we are left with the change due solely to the complex variable.
C) The control group change (O2 - O1) contains the change in the independent variable due to the dependent variable and extraneous variables. When we subtract from this the experimental group (O4 - O3), which is the change due to the extraneous variables, we are left with the change due solely to the dependent variable.
D) The experimental group change (O2 - O1) contains the change in the dependent variable due to the dependent variable and extraneous variables. When we subtract from this the control group (O4 - O3), which is the change due to the extraneous variables, we are left with the change due solely to the dependent variable.
E) The experimental group change (O2 - O1) contains the change in the dependent variable due to the independent variable and extraneous variables. When we subtract from this the control group (O4 - O3), which is the change due to the extraneous variables, we are left with the change in the dependent variable due solely to the independent variable.