Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :

-Which of the following statements, if true, would most seriously weaken the conclusion that the treatment is effective?

A) Statistical analyses reveal a p-value of only 0.01.
B) There is reason to believe that the placebo contains a substance that might tend to weaken performance.
C) The researcher who scored the tests was unaware of which tests were completed by control group members.
D) Subjects in the control group were told they were receiving an effective form of treatment.