Which method can be used to select scenes by their index in Unity's SceneManager?

The method that allows you to select scenes by their index in Unity's SceneManager is GetSceneByBuildIndex(). This method specifically retrieves the Scene object that corresponds to the specified build index. In Unity, scenes are often listed and organized by their build index in the Build Settings, starting from zero for the first scene added. By using the build index, you can programmatically access and manipulate scenes, making it easier to load, unload, or manage them within your game.

In contrast, the other options do not serve this specific purpose. GetSceneByName() would require you to know the scene's name rather than its index. LoadSceneByIndex() might sound relevant, but it's typically associated with loading a scene rather than retrieving it. Finally, FindScene() is not a standard method in Unity for scene management, creating confusion around its relevance to selection by index. Thus, GetSceneByBuildIndex() clearly stands out as the appropriate choice for selecting scenes based on their build index.