Provide an Appropriate Response

Provide an appropriate response.
-A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. One hundred
Members of a weight loss group who are patrons of the nutrition center sign up for the treatment or the control
Group. After 50 have signed up for the control group, the rest are assigned to the treatment group. The members
Of the treatment group are given the herb with instructions as to use and a planned diet for six weeks. The
Control group is given a placebo with the same instructions and same diet. A nurse at the nutrition center
Weighs each subject on Friday of each week. Identify any problems that are likely to cause confounding.

A) Method of formation of the control and treatment groups
B) Placebo effect
C) Experimenter effect
D) The study is essentially free from potential sources of confounding.