Why did millions of people move from rural areas to the cities to work?

As a consequence of the Industrial Revolution, which began in the 19th century in England, cities began to be created that centralized industries and the incipient technological poles. Thus, cities such as Manchester became true centers of production, which required a large amount of labor in order to maximize their industrial production and, therefore, their profits.

This encouraged the movement of millions of people from rural areas, in which they carried out a subsistence economy, to the cities, where they would enter the system of wage labor in industrial production tasks.

b). (sounds as the best answer)

the ss was the main organization responsible for the genocidal murder of around six million people of european ethnic minorities, essentially jews, in the holocaust. the members of all its branches committed war crimes and crimes against humanity during the second world war (1939-1945). likewise, the ss were involved in commercial enterprises and exploited the inmates of the concentration camps as slave laborers.

the tortures and assassinations committed by the ss were the result of an ideology developed long before the armed conflict, this ideology was based on the racial supremacy of the germans over the rest.