Final answer:
Off-duty time is when an individual is fully relieved of all work duties and responsibilities, which is accurately described by answer A in the given options. The other options involve work-related responsibilities and thus do not qualify as off-duty.
Step-by-step explanation:
Off-duty time refers to periods when an individual is completely relieved of all work duties and responsibilities. According to U.S. labor laws and regulations, the correct answer is A. Time when you're relieved of all duty or responsibility for performing work.
The other options provided in the question do not qualify as off-duty time. Option B, time engaged in non-driving work-related activities, and Option C, time doing paid work for someone else, both involve some form of work responsibility and are therefore not considered off-duty. It's important to recognize the distinction between being actively engaged in work, even if it's not one's primary job, and being completely relieved from work obligations to be considered off-duty.