LSAT-2003-06--3--9

Writer: I collaborated with another writer on my last book, instead of writing alone as I usually do. Because the book sold so well as a result of this joint effort, I should collaborate with a writer on my next book so that book will sell well too.

Which one of the following principles if valid most helps to justify the reasoning above?

A. If a person's book sells well because of a collaboration, that person's next book will sell well, if he or she collaborates with the same writer.

C. If a person's book sells well because of a collaboration, future collaborations on the part of that perosn will produce other books that sell well.

I only struggle between these two answers, so I don't want to waste time of printing all the answers, anyone can help, I'd appreciate.

A means the collaboration of next book between the writer and same collaborator.However, the stimulus only means collaboration with any other people to write the next book. So A is wrong.