Answer: B. Multiple outbreaks of cholera
Explanation:
The sewage crisis, frequently referred to as the "the Great Stink", took place in London, in July and August of 1858. Prior to this crisis, London did experience multiple outbreaks of cholera, but this was not a contributing factor to the sewage crisis. However, the growth of population, as well as flushing toilets which overburdened the sewerage system, did lead to the Great Stink. Over the course of one century, London has experienced a population growth from one million citizens to over three million, which affected all areas of life in the city.