【单选题】

Questions 141-143 refer to the following memorandum.

It is my deepest regret (141) you that theBoard ofDirectors has agreed to require a two-week unpaid leave for all employees in order to avoid an operation budget deficit. The company is facing a serious crisis (142) poor profits over the past three quarters.
The budget is short by about $7 million and, according to our company policy, the budget must be balanced by September 30, which is the end of this fiscal year.
It is (143) for all employees to give up two weeks’ pay in order to put a halt to the budget crisis.Employees are to speak to their managers regarding setting up the two weeks that are convenient for them.
I am genuinely sorry for the need to take such radical measures to end the current emergency, but with your cooperation, we can overcome this situation.
A、owing to
B、although
C、since
D、as