55. What was the most significant result of Martin Luther's attempt to reform the Catholic Church?

A.
His ideas later allowed John Calvin to formalize Protestant ideas.
B.
His ideas spread to Germany and led to the separation from the Roman Catholic Church.
C.
His ideas spread quickly and many people joined the Catholic faith.
D.
His ideas questioned the infallibility of the Pope, and, as a result, many began to doubt the Pope's authority.