All of the options listed could be associated with the impact of the humanism movement in various ways, but the one that most directly reflects the ideals of humanism itself would be The Canterbury Tales, by English writer Geoffrey Chaucer.
Humanism emphasized the study of classical texts, the value of human experience and ethics, and often focused on literature and the human condition. Chaucer’s work is celebrated for its exploration of human traits and societal norms, aligning closely with humanist ideals.
The Gutenberg Bible represents the technological advancement of the time, while Martin Luther's 95 Theses is more closely related to the Reformation, and The Odyssey, although studied, is more classical than humanist in orientation.
So, in this context, the best answer would be The Canterbury Tales.