" In 1853-54, the city of London was the site of a massive outbreak of the disease known as cholera, a bacteria that is carried in human waste. In that year alone, approximately 10,000 Londoners died from cholera." The problem in the quote above could be solved by

A) Factory rules and regulations
B) Public sanitation and sewer system
C) Public education
D) Police forces

no links/files plz