Final answer:
During daylight savings time, no hours are subtracted; instead, one hour is added to the clock in the spring. The subtraction occurs in the fall when daylight saving time ends.
Step-by-step explanation:
During daylight savings time, we adjust our clocks to make better use of daylight in the evenings. Specifically, we subtract an hour in the fall when daylight savings time ends, and we add an hour in the spring when it begins. So the correct answer to the question is D) No subtraction, since during daylight savings time itself we add an hour to the clock.