When an organization defines itself and its niche in an environment by the choice of what sector or field of the environment it will use its technology, products, and services to compete in and serve, it is describing its .

Domain

Explanation:

It should be noted that When an organization defines itself and its niche in an environment by the choice of what sector or field of the environment it will use its technology, products, and services to compete in and serve, it is describing its Domain. Domain can be regarded as the chosen field of action for an organization/company, it encompass the part of the environment chosen by the organization which is vital to the organization, it involves the chosen niche of the organization in the environment.

n

explanation:

an important city to the south and the region's capital is c. kiev