An example of a layout tool is which of the following?

The selection of outside calipers as a layout tool is appropriate because their primary function is to measure the distance between two opposite sides of an object, which aids in laying out dimensions accurately when marking or cutting materials. Outside calipers help ensure precision when working with larger pieces, making them crucial in scenarios that require a high level of accuracy.

Tape measures are primarily used for measuring lengths, while a level is essential for establishing horizontal or vertical alignment, and a protractor is specifically designed to measure angles. Although these tools are valuable in various applications related to layout or measurement, outside calipers specifically excel at gauging the width and ensuring proper spacing, making them fitting for the role of a layout tool.