【单选题】

Dear sales staff,

The purpose of this memo is to advise you about changes to our expense account policy. The management feels that the company needs to cut spending in this area, so we are introducing some key regulations that we expect you all to (28) .
The first change is that the company will only pay for economy-class airfares and budget accommodations, regardless of how far away you need to travel. We expect that this will help us to make substantial (29) .
The other major change involves the use of company money to entertain potential clients. We understand that socializing with clients can sometimes be an important step in securing a contract and building a relationship. However, from now on, you will need to consult the financial manager, JennyBarnett, first, and you will be reimbursed only if you have her (30) .
Wehope you understand the need for these changes.
Regards,
ValBobbins, ManagingDirector
A．acquire
B．sustain
C．complain
D．follow