What was the first full-sized book ever printed by Gutenberg?

The first full-sized book ever printed by Johannes Gutenberg was the Bible, specifically the Gutenberg Bible, also known as the 42-line Bible. Printed around 1455, it marked a significant moment in the history of printing and the spread of literature. By utilizing movable type, Gutenberg revolutionized the process of book production, allowing for faster and more efficient printing compared to the manual copying methods used prior to this innovation.

The significance of the Gutenberg Bible extends beyond its status as the first printed book; it played a crucial role in making literature more accessible to a broader audience, thus contributing to the spread of knowledge and literacy during the Renaissance and Reformation periods. This accessibility facilitated the dissemination of religious texts and ideas, which profoundly shaped European society and religious thought.

The other options consist of important works from various traditions, but none were printed by Gutenberg as full-sized books.