Which of the following environmental changes could most likely kill a large

portion of a population?

A. A flash flood

B. Cyclic temperature fluctuations

C. An annual dry season

D. Above-average precipitation levels over a year

A. A flash flood

Explanation:

A flash flood would most likely kill a large portion of a population because it the only event that happens instantaneously and can cause a large amount of damage. The other environmental changes happen over time and/or are based on already occurring cycles.