Answer:
B. add value to
Explanation:
Customer service includes all forms of assistance and advise given to a firms' customer.
A firm with good customer service adds value to the firms' product.
For instance, if I buy a decoder and can't figure out how to set it up, if I contact a firm's customer service and they are unresponsive or provide bad service, I might be unable to effectively use the decoder. This would reduce the value of the decoder to me.
But if I contact the customer service and they are prompt to answer my questions and give assistance, the value of the decoder to me would be enhanced.
I hope my answer helps you