Answer: c. retain loyal customers
Step-by-step explanation:
Retaining loyal customers is very important for the business because you don't want to lose your most loyal customers hence you have to ensure you keep them happy.
Some of the ways that companies can do this is through giving them great service such that they can even boost about that service to others through the word of mouth.
Attend to their issue in as soon as possible. Create some rewards scheme which will mean that their loyalty is not in vain.
Such as Toasties restaurant who rewards their loyal customers when they have spend 50 dollars, this will retain their loyal customers because every person want to be rewarded for their effort and support.