Which of the following films signified a major advancement in computer-generated imagery (CGI)?

The choice of Toy Story as a film that signified a major advancement in computer-generated imagery (CGI) is well-founded. Released in 1995, Toy Story was the first entirely computer-animated feature film, marking a significant milestone in animation history. Its successful use of CGI not only showcased the technical capabilities of computer-generated images but also demonstrated how they could tell compelling stories and deliver vibrant characters. As such, Toy Story laid the groundwork for future animated films and established a new standard in the animation industry, influencing countless subsequent projects.

While other films listed, such as Jurassic Park and Avatar, certainly made significant contributions to CGI in their respective contexts—Jurassic Park for its lifelike dinosaurs and Avatar for its revolutionary use of 3D technology and special effects—Toy Story remains the pivotal work that initiated the era of fully computer-animated cinema. Snow White and the Seven Dwarfs, produced in 1937, was groundbreaking for traditional hand-drawn animation but does not pertain to CGI advancements.