The correct response that models a hypothetical situation in which every location on Earth would have 12 hours of daylight and 12 hours of darkness every day is:
C. Earth does not tilt on its axis.
If Earth had no tilt, the sun would consistently rise and set in a way that results in equal day and night throughout the year at all locations on Earth, leading to 12 hours of daylight and 12 hours of darkness every day.