An organization is a group of people who together work to achieve

the correct answer is "a common purpose/objective"

Explanation:

there are several main characteristics in an organization that separates it from an individual. they are,

an organization always includes more than 1 person

the group of people share a common objective

the group has special and unique way of doing things and how they view those who are "not" a part of their group. this can be said as the organization's culture too.

when all these things are present, we call it an organization and often in the real world, an organization can achieve much more than an individual.