Final answer:
The rapid spread of the Reformation in Europe was facilitated by the use of the printing press to reproduce the writings of the reformers and distribute them across Europe.
Step-by-step explanation:
One of the reasons for the rapid spread of the Reformation in Europe was the use of the printing press to reproduce the writings of the reformers quickly and in large numbers for distribution across Europe. The printing press enabled Martin Luther and other reformers to disseminate their ideas widely and reach a larger audience. By printing and distributing pamphlets, books, and other written materials, the reformers were able to spread their message and attract followers in different parts of Europe.