How Was the Choice to Embrace or Reject the Protestant

How was the choice to embrace or reject the Protestant reform movement made in each territory or region of the Holy Roman Empire?

A) Individual parishes selected their leaders, who would decide whether to reform the parish.
B) Local religious councils determined whether or not to embrace reform.
C) Individual priests decided whether or not to embrace the reform movement and introduce new doctrines and practices.
D) The political leader(s) of the territory or region determined whether to introduce reforms.