What kind of tasks can humans do simultaneously while driving?

Humans can effectively perform two predictable tasks simultaneously while driving when they have had practice in doing so. This concept relates to the idea of divided attention—the ability of a person to focus on multiple tasks at once. However, the tasks need to be predictable and not overly complex. For example, a driver may be able to adjust the volume of the radio while maintaining control of the vehicle, provided that both tasks are familiar to them.

The reasoning behind the ability to perform two predictable tasks is rooted in the brain's capacity to manage activities that do not require full cognitive engagement. Driving itself demands a significant portion of attention due to the need to continuously assess the road, speed, and surrounding vehicles. When one of the tasks is simple and has become second nature, it allows a driver to engage in it without fully detracting from their primary focus, which is driving.

In contrast, options that suggest performing any two tasks or various tasks without considering their nature or predictability overstate the capabilities of divided attention. Furthermore, saying that only one task can be performed at a time overlooks the human ability to multitask to a certain extent with sufficient training and familiarity. Thus, option B accurately reflects the realistic limits of human multitasking in the context of safe driving.