How Did Boniface (680-754), Who Established Churches in Germany and Gaul

How did Boniface (680-754) , who established churches in Germany and Gaul, demonstrate his loyalty to the church in Rome?

A) By publicly proclaiming his support at meetings of the clergy in England
B) By changing his name from the Anglo-Saxon Wynfrith to the Latin Boniface
C) By insisting that German converts declare loyalty to Rome at their baptism
D) By wearing a monastic habit favored by the Roman church