What type of file does Yuki need for printing the pictures in her memory book?

Yuki needs a raster file for printing the pictures in her memory book. Raster files are composed of pixels, making them ideal for detailed images such as photographs and digital artwork. When printed, raster images can produce high-quality, vibrant results because they contain a rich amount of color information and detail. Common raster file formats include JPEG, PNG, and TIFF, all of which are suitable for printing purposes.

In contrast, vector files, while offering scalable images that maintain clarity at any size, are more suited for illustrations, logos, and graphics rather than photographic content. 3D models are used for visualizing three-dimensional objects and are not appropriate for traditional printing of pictures. Animations involve sequences of images and motion, which do not apply when the goal is to print static pictures. Therefore, for Yuki's purpose of printing pictures, a raster file is the most appropriate choice.