Milagros designed a game by dragging and dropping pre-made blocks that contain elements of code. Which term best describes what Milagros used?

The term that best describes what Milagros used is "block-based programming" or "visual programming." This approach allows users to create programs by manipulating blocks that represent code constructs, making it easier to understand and use, especially for beginners. Examples of block-based programming environments include Scratch, Blockly, and App Inventor.