Answer:
D. It would not run, because the on start block is needed to start a game.
Step-by-step explanation:
The on start block is a special block in most programming languages, including Scratch, that is executed when the program is first run. This block typically contains instructions that are needed to set up the game or program, such as initializing variables, setting the background color, or displaying a title screen. Without the on start block, the game would not be able to run properly, because it would not have any instructions for how to set up and start the game.