Which of the following terms refers to a diagram or representation from stone?

The term that refers to a diagram or representation from stone is "lithograph." Lithography is a printing process that involves creating an image on a flat surface, traditionally stone, and then transferring that image onto paper. This technique allows for detailed graphical representations and has been used historically in art and for reproducing written materials. The process takes advantage of the immiscibility of oil and water, allowing for distinct and high-quality images to be produced.

The other terms, while they relate to imagery and representation, do not specifically denote a connection with stone. A pictograph typically refers to a symbol or picture that represents a word or concept, primarily in a visual context without the direct reference to stone. A photograph captures images using light-sensitive materials and does not stem from a stone medium. A graph is a visual representation of data relationships but is not associated with stone either. Therefore, "lithograph" is the most accurate choice in this context.