What Is Suggested by the Following Statement Found in the Study

What is suggested by the following statement found in the study by Koenes and Karshmer titled "Depression: a comparison study between blind and sighted adolescents? " "The fact that the inventory [instrument] was administered verbally introduced a potential bias of social desirability."

A) Implications for practice
B) Limitations of the study
C) Generalizability of the study
D) Recommendations for future research