When and where did St. Patrick's Day originate?

St. Paddy's Day started as a religious celebration in the 17th century to commemorate the life of Saint Patrick and the arrival of Christianity in Ireland.

Explanation:

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The correct answer to the question stated above is letter C which is: They sailed up the navigable rivers of Europe and across the Atlantic in longships.

 Vikings were Germanic Norse seafarers, who raided and traded from their Scandinavian homelands across wide areas of northern and central Europe and European Russia, during the late 8th to late 11th centuries.