Which of the Following Sentences Is the Most Concisely Worded

Which of the following sentences is the most concisely worded?

A) The project manager is in charge of furnishing specifications until such time as the project gets underway.
B) All specifications should be provided by the project manager prior to the start of a project.
C) Project managers have the capability of changing specifications before the official start date.
D) The project manager must give the engineers the revised specifications before the project starts.