On the September equinox, which usually occurs around September 21st, the Earth is positioned in a way that the tilt of its axis is neither inclined towards nor away from the Sun. This means that the Sun is directly over the equator.

Option 1: 8 hours - This option suggests that the equator experiences 8 hours of daylight on the September equinox. However, this is not correct. On the equinox, the amount of daytime and nighttime is equal, so the equator would experience 12 hours of daylight.

Option 2: 9 hours - This option suggests that the equator experiences 9 hours of daylight on the September equinox. However, this is not correct. As mentioned earlier, on the equinox, the amount of daytime and nighttime is equal, so the equator would experience 12 hours of daylight.

Option 3: 10 hours - This option suggests that the equator experiences 10 hours of daylight on the September equinox. However, this is not correct. On the equinox, the amount of daytime and nighttime is equal, so the equator would experience 12 hours of daylight.

Option 4: 12 hours - This is the correct answer. On the September equinox, the equ