Zwingli Called Representatives of the Radical Reform Anabaptists

Zwingli called representatives of the radical reform anabaptists. What does this term mean?

A) Re-baptizers, because they taught that infant baptism did not count
B) Non-baptizers, because they renounced every sacrament, even baptism
C) Twice-baptizers, because they believed you had to get baptized twice (once for repentance and once for justification)
D) No one knows, but they became the forerunners of the Baptist Church