The correct answer is the fourth one: The Bible was printed in common language.
Martin Luther published the first full translation and the first printed edition of the Bible in German in 1534, before that, the Bible was only written in Latin, Greek, and Hebrew. Luther used the new technique invented by his countryman Johannes Gutenberg, the printing press, which allowed him to print numerous editions of the Bible in German language and disseminate it widely. It was a crucial phenomenon for the success of the Protestant Reformation since it permitted common people to have access to the scriptures and interpret them, it expanded literacy, and it helped to undermine the power of the Church and the educated ecclesial elites.
