Singapore airlines is recognized as an industry leader for exemplary customer service, and has continued to add new ways to serve customers better than competitors. in doing so, it has focused on sustaining its competitive advantage through excellence.

a. customer
b. operational
c. sustainable
d. product
e. locational

(A) Customer

Explanation:

 The customer excellence is the process of fulfill all the requirement of the products based on the products and the services in an organization.

The main aim of the customer excellence is that it makes the consumer more satisfied by providing an effective services as they always focus on the actual needs of the customers with loyalty.

 According to the given question, the Singapore airlines is basically focused on the various types of competitive advantages by using the customer excellence in an organization.  

 Therefore, Option (A) is correct.

the answerr would be 1

answer; because many corporate watch groups will discover and publicize unethical behavior by suppliers, link it to the american company, and harm its reputation;