Answer:
Option B
Step-by-step explanation:
Living conditions were bad in industrial city as they were overcrowded hence the cities would not have provided good housing or life expectancy and hence, option A is not correct
The jobs of the workers was not even safe as they can be fired at any time. Hence, option D is also incorrect.
However, industrial cities usually are safe as 24/7 surveillance system is operational there
Hence, option B is correct