A psychologist interested in anxiety claims to have shown that anxious people will pay more for a meal. Twenty subjects were recruited. A randomly-chosen ten were asked to refrain from drinking any li__. What is the completion of the sentence?
A) while the other ten were not given any instructions
B) while the other ten were asked to drink water only
C) while the other ten were asked to consume alcohol
D) while the other ten were asked to consume caffeine