Your Bid to Set Up the Computer System at Evergreen

Your bid to set up the computer system at Evergreen, a small local business, was accepted. Today you found out that the software that Evergreen's systems require just had a price increase, so your bid will need to increase to reflect this change.
-Including which of the following in your message communicating the price increase to Evergreen will best ensure that your audience will accept the bad news?

A) a justification that the increase is due to an unexpected jump in the price of the software
B) a statement that the increase is unavoidable and due to circumstances beyond your control
C) a profuse apology that you must increase your price
D) an acknowledgement that the customer will be disappointed by this news
E) a comment that the price increase will result in hidden benefits