【单选题】

When customers aren’t happy with your business, they usually won’t complain to you. (144) , they’ll probably complain to just about everyone else they know--and take

their business to your competition next time. That’s why an increasing number of businesses are making follow-up calls or mailing satisfaction questionnaires after the sale is made. They find that if they promptly follow up and resolve a customer’s complaint, the customer might be even more (145) to do business than the average
customer who didn’t have a complaint.
In many business situations, the customer will have many more interactions after the sale with technical, service, or customer support people than he or she did with the sales people. So if you’re serious about (146) customers or getting referrals, these interactions are the ones that are really going to matter.
(Source:BusinessTown.com)
A．detaining
B．retaining
C．remaining
D．sustaining