The correct option is B
The increase of the urban population in cities with medieval layout meant overcrowding, unhealthiness and the appearance of the first social pathologies (alcoholism, prostitution and delinquency). The British agricultural revolution also made more efficient the production of food with a lower contribution of the labor factor, encouraging the population that could not find agricultural jobs to look for jobs related to the industry and, therefore, originating a migratory movement from the countryside to the cities as well as a new development in the factories.
The population of England and Wales, which had remained constant around 6 million from 1700 to 1740, increased sharply as of this date and reached 8.3 million in 1801, to double in fifty years and reach 16.8 million in 1850 and in 1901 it had almost doubled again with 30.5 million.