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.
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I think the most reasonable answer would be the second option, B. “Critical value”
There can be 132 ways that can be selected
The correct spelling answer is a