People are the key ..... in any service: services are usually produced and consumed simultaneously, and aspects of the customer experience are adjusted to serve the needs of the individual consuming them.

English as a Second Language Single question discussions
1

People are the key ..... in any service: services are usually produced and consumed simultaneously, and aspects of the customer experience are adjusted to serve the needs of the individual consuming them. (*) argument (*) cement (*) element (*) sentiment

This is a companion discussion topic for the original entry at https://english.best/questions/11528,people-are-the-key-___-in-any-service-services-are-usually-produced-and-consumed-simultaneously-and-aspects-of-the-customer-experience-are-adjusted-to-serve-the-needs-of-the-individual-consuming-them/