Answer:
a. Karl Marx.
Explanation:
Karl Marx -
Karl Marx was born in Germany , Trier and studied philosophy and law .
He is the famous German philosopher , socialist revolutionary , journalist ,
political theorist , sociologist , historian and economist .
He gave the idea about the factory safety rules or the limited work day .
Some of the famous works of Marx are the three-volume Das Kapital and The Communist Manifesto .
Hence, from the given information of the question ,
The correct option is a. Karl Marx .
