Why does the duration of day and night change in a year

The change between day and night is caused by the rotation of the Earth on its axis. ... The changing lengths of days and nights depends on where you are on Earth and the time of year. Also, daylight hours are affected by the tilt of the Earth's axis and its path around the sun

that is correct.

answer; /// i believe that the correct answer is (d); /// alternate walking and running;