The invention of the printing press (option A) allowed for the spread of Renaissance ideas from Italy to the rest of Europe the most. The printing press, famously developed by Johannes Gutenberg, revolutionized the dissemination of knowledge by making it possible to mass-produce books and written materials. This invention greatly facilitated the spread of Renaissance art, culture, and ideas throughout Europe, as it enabled the widespread distribution of texts, including classical works and new Renaissance literature and art, to a broader audience. Hope this helps you