Which of the following is most likely to be a warning that an advertisement
relies on pseudoscience, not science?
o
a. testimony is provided from scientists who are experts in the field.
o
b. paid actors are used in the ad instead of actual customers.
o
c. unbiased experimental data are presented to support their claims.
d. a link is given to the results that were published in a peer-reviewed
journal.

Explanation:

You would accept both A and D as being true. Both groups might be paid a small stipend for giving their testimonials but the amount would be to cover their time and travelling. They may not even be offered that.

You'd also accept C. Numbers, unless they are manipulated, generally don't lie.

B is the answer, but how would you know? How could you tell you were dealing with paid actors. However B is the answer.