Raining Cats and Dogs - Answer

The answer is A!

It's raining cats and dogs is an expression used to when there's a raging storm

This phrase, around since at least 1700, has several theories surrounding it.  A popular Northern European myth was that cats supposedly influence weather and dogs symbolize wind.  

Most likely, with primitive systems in use in the seventeenth century, a heavy rainstorm would cause gutters to overflow with a torrent of debris that included garbage, sewage, and dead animals.

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