Why did Karl Marx think the economic system of the world would change?

The workers would replace capitalism with a communist economic system, in which they would own property in common and share the wealth they produced.

Explanation:

workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.

the answer would be a).