From the age of two to about three, children move to playing alongside other children without much interaction with each other. They may be engaged in similar activities or totally different activities but they like being around others their own age. Even though it may appear that they don’t care about the presence of the other children, just try separating them and you will see this contact from a far is very important to them.
Explanation: A job is only for a certain time. A salary is the money you make during your time at a job. A workforce is an area of work multiple people work in. This leaves the only remaining answer as Career.