If Skiff’s book is published this year, Professor Nguyen vows she will ... ...

If Skiff’s book is published this year, Professor Nguyen vows she will urge the dean to promote Skiff. Thus, if Skiff’s book is as important and as well written as Skiff claims, he will be promoted, for Nguyen will certainly keep her promise, and the dean will surely promote Skiff if Nguyen recommends it. The argument’s conclusion can be properly inferred if which one of the following is assumed?
(A) Skiff’s book will be published this year if it is as important as he claims it is.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2013 LSAT (PT69): Logical Reasoning B