The statement is correct.
When a flood is giving a time-bonding term, such as the 100-year flood, in this statement, it means that it has been noticed that the floods from the particular river occur on approximately that much of a time span.
If there has been a flood recently, than it most probably means that there isn't going to be a flooding caused by that river for the foreseeable future.
Now, there's always exceptions, as the climate patters are changing constantly, and there's always surprises, but in general, in lot of regions of the world, there has been noticed a certain consistency in some natural occurrences.
I believe it’s D. It can be a cycle
You didn't place any of your following answers, which makes it difficult for people to help. What do you think it is? Out of the options that you have.
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True.
The Parthenon was built by the Athenians at the peak of their power as a temple to Zeus.