The most powerful catholic ruling family in the 1600s was the: a. tudorsb. hapsburgsc. hohenzollernsd. bourbons

The Habsburgs, 100%. The Tudors weren't Catholic, and famously so. The Hohenzollerns and Bourbons never came close the the Holy Roman Empire in power at its pique. The Hohenzollerns were later as well, although I confess I am not quite as learned on their history. Had the Tudors been Catholic, it might be a contest, as Elizabethan England was certainly a height of the British Empire.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

im going to go with b.