(Scenario I) Suppose That a Company Markets a Subliminal Audio-Tape

(Scenario I) Suppose that a company markets a subliminal audio-tape designed for people wanting to lose weight. As evidence that the product is effective, it cites a study based on 100 randomly selected overweight participants demonstrating that people listening to the tapes for 10 weeks lost-on average-6 pounds. Which of these is NOT a reason to be skeptical of these claims?

A) The weight loss could have been due to a placebo effect.
B) The weight loss probably is not representative of how much weight a typical overweight person would lose.
C) The weight loss could be due simply to the fact that the participants were motivated to lose weight.
D) It is impossible to determine if the weight loss was caused by the subliminal messages based on the information provided.