Answer:
"a. Several reformers believed that the only way to gain salvation was by buying indulgences and converting other people" is the best option from the list, since it was precisely the idea of indulgences being a bad thing that led reformers to rise against the church.
Explanation:
You could say C and D but most probably D.
My answer is C. Congress is required to meet at least once every year.
I hope I helped!
