Shortly after the first roof was invented, someone began complaining about the deluge by the door; so the first downspout was created to divert the flow.

By the 13th century, church design had them dispensing blessings as well.

Sometimes in the shape of an angel, occasionally in the form of an animal, mostly looking like some scary creature; but always shedding water out their mouths, it's where we get the word "gargle" -- so D is correct.






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