Answer: Dual processing.
Explanation: The scenario described, where a person can think about unrelated matters while driving without focusing on operating the car, illustrates the concept of dual processing. Dual processing refers to the ability of our minds to engage in conscious thinking and processing while simultaneously performing routine or automatic tasks. In this case, driving becomes an automated task, allowing the person to allocate their conscious attention to other thoughts and tasks such as planning for groceries and homework assignments.