Which of the Following Lessons Was Illustrated by Flood Data

Multiple Choice

Which of the following lessons was illustrated by flood data from the Colorado River and from the Yellowstone River?

A) fifty years is a long enough record to record all but a 100-year flood
B) the largest flood possible along a river is likely to have been witnessed by humans
C) few floods are ever larger than 10,000 cubic meters per second
D) none of these