He Emperor Charlemagne spread Christianity among the Saxons by

Aexcluding pagans from trade and commerce.
Bby way of exemplary faith that set an example.
Cimposing taxes on those who didn't convert.
Dgiving pagans a choice of conversion or death.

Verified Answer :

Neuron

The great Charlemagne was spreading christianity among the Saxons through giving pagans a choice of either conversion or death - D.

When he conquered a village or a town, he gave the people the option to either convert to the new religion or suffer a worse fate than that.