smithward. inc. manufactures reusable water bottles. it targets its marketing campaigns at different market ________, including outdoor enthusiasts, health-conscious buyers, and young people who want the current fashion accessory.

The missing word is segments.

So the complete sentence is:

“Smithward, Inc. manufactures reusable water bottles. It targets its marketing campaigns at different market segments , including outdoor enthusiasts, health-conscious buyers, and young people who want the current fashion accessory.”