I think it is this
Pope Leo III crowned the Frankish king, Charlemagne, Emperor of the Romans on Christmas Day, 800 in St. Peter's Basilica in Rome, making him the most powerful ruler of his time. ... 747 - 814) set out for Rome. The pope had summoned him, because he could no longer fend off his enemies in the city.
Hope it helps you
Please mark me as Brainsliest
I think it is B. 1950's, but that is just a guess so if I'm wrong then I'm sorry
Hope this helps. :)
States cannot force associations to accept members