Which statement correctly defines the Duty Period?

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The main idea is that a duty period is the on-duty window for flight operations. It begins when you report for the first scheduled activity of the day and ends when you are released from duty or when a required rest period begins. This captures everything you’re responsible for during that day—preflight planning, ground duties, and all flight time—within the period you’re considered on duty. The statement that starts at the first scheduled activity and ends with a rest period fits this concept precisely, because it marks both the start of on-duty responsibilities and the point at which you transition out of duty. The other options don’t fit: a fixed 24-hour cycle isn’t how duty time is defined; sunrise to sunset is arbitrary and unrelated to duty status; and simply “from first flight to last flight” ignores preflight duties and the rest-release boundary that ends the duty period.