Answer:
A. The treatment group; the thought disorder scores
Step-by-step explanation:
Independent variable: In research, the independent variable is described as a variable that is considered independent of any change and can be manipulated, changed, or altered by the experimenter in order to see its effect on the dependent variable.
Dependent variable: In research, the term dependent variable is defined as a variable that is considered as under control of the researcher and can be measured or tested by the researcher. If a researcher makes any change in the independent variable then it will affect the dependent variable directly.