We want to find am argument the author gives against gray marketing. According to our passage map, where would we find this?
Paragraph 3. The authors states, "Trademark owners JUSTIFIABLY argue against gray marketing" and gives two reasons: (1) jeopardize goodwill and (2) cease to promote the product
We want to find something that deals with one or both of these. (B) does this by saying that "Gray marketing can discourage product promotion by authorized distributors" which is almost verbatim line 33. The rest are simply not discussed.