The correct option is D The invention of the printing press
The Lutheran Reformation (A) in 1521, too late to be the correct answer to this question. It is, however, the next closest answer. The League of Nations (C) was formed in 1920, following the First World War. (D) Muslims invaded Spain in 711. (E) The Carolingian Empire fell during the tenth century. (B)The printing press was invented in 1450 by Johannes Gutenberg.