Which action illustrates protection from sun exposure for children on the playground?

Building a roof over the sandbox effectively illustrates protection from sun exposure for children on the playground. This action provides a shaded area where children can play without being directly exposed to sunlight, reducing the risk of sunburn and heat-related illnesses. Since sandboxes are stationary play areas where children often spend extended periods of time, having a roof can create a safer and more comfortable environment.

Other options, while they may contribute to overall playground safety and functionality, do not specifically address sun protection. Placing swings and slides far apart reduces the risk of collisions but does not provide shade. Arranging playground equipment for visibility enhances supervision but does not impact sun exposure. Minimizing walking through swing areas promotes safety around moving equipment but again does not address the need for shade or protection from sun exposure.