Which option is a quick way to create a background layer in After Effects?

Creating a background layer in After Effects is most efficiently achieved by selecting Layer, then New, and choosing Solid. This method allows you to create a solid color layer that can serve as a versatile background for your composition. The Solid layer can be easily customized in terms of color, size, and other properties to fit your project's aesthetic requirements.

This option is widely recognized as the standard approach for establishing backgrounds, providing users with immediate access to a solid fill, which can be modified in various ways through its Layer settings. By using this method, you can quickly set the foundation for your design and ensure that it integrates seamlessly with other elements in your composition.