Which Change in Sample Selection Procedures for the Study by Koenes

Which change in sample selection procedures for the study by Koenes and Karshmer titled "Depression: a comparison study between blind and sighted adolescents" would have had the greatest impact in making the sample of blind adolescents more homogeneous?

A) Elimination of subjects taking prescription medications
B) Narrowing the age range of subjects to those between 13 and 18 years
C) Having the same person administer the questionnaire to all subjects
D) Not telling the subjects the nature of the study

Correct Answer:

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