The Reformation was a movement throughout Europe to

Areturn to the traditional structure of the church.
Bchange practices of the traditional church.
Crepeal changes to the traditional church.
Dinstall kings as supreme rulers of the church.

Verified Answer :

The Reformation was a movement throughout Europe to "b. change practices of the traditional church," since this was the "Protestant Reformation," which sought to curb corruption in the Catholic Church and put the focus more on worship. 

The answer for your question is B