Which of the Following Refers to Service

Which of the following refers to service?

A) the speed and dependability with which an organization delivers what customers want
B) the technique of keeping costs low to achieve profits and to be able to offer prices that are attractive to consumers
C) the practice aimed at discovering and harnessing an organization's intellectual resources
D) the technique of establishing goodwill through social relationships
E) the skill of understanding oneself, managing oneself, and dealing effectively with others