Which of the Following Best Demonstrates Concise Writing

Which of the following best demonstrates concise writing?

A) There are several things that each and every employee must know about workplace hazards.
B) The directors are of the opinion that HAZMAT training is absolutely essential.
C) Although this training is a company requirement, it must be completed at the employee's expense.
D) This is to inform you that until such time as training is completed, pay raises will be withheld.