GMAT Critical Reasoning (CR) | Re: During the last 18 years, the number of people who live or work in the

During the last 18 years, the number of people who live or work in the Dry river Valley, which is prone to flash flooding, has continually increased, as has traffic on local roads and bridges. However, the number of people caught in flash floods has decreased, even though the annual number of floods has increased slightly.

Which of the following if true, best explains the decrease described above?

A) Flash floods are more likely to happen in the first hour of a rainstorm than afterward.
B) Flash