Which of the following is correct concerning a communist system of government? (1 point)

O The concept of communism was developed by Karl Marx and Friedrich Engels.
O Countries such as Denmark, Norway, and Sweden are modern examples of communist systems.
O Communist systems allow private individuals to make economic decisions.
O Communist systems pay people based on their contributions to society.

The correct statement is:

- The concept of communism was developed by Karl Marx and Friedrich Engels.