The correct answer is D. All of the above.
The period of daylight is the time of day when the sun is above the horizon. It varies with latitude and the season. Near the equator, the period of daylight is nearly constant throughout the year. However, at higher latitudes, the period of daylight varies more, with longer days in the summer and shorter days in the winter. In the polar zones, the sun does not rise above the horizon at all during the winter, and it does not set below the horizon at all during the summer.
The period of daylight is determined by the Earth’s tilt and its orbit around the sun. The Earth’s axis is tilted at an angle of 23.5 degrees relative to its orbital plane. This tilt causes the sun to appear higher in the sky at some times of the year than at others. In the summer, the sun is higher in the sky, and the days are longer. In the winter, the sun is lower in the sky, and the days are shorter.
The Earth’s orbit around the sun is elliptical, which means that the Earth’s distance from the sun varies throughout the year. The Earth is closest to the sun in January and farthest from the sun in July. This difference in distance does not have a significant effect on the length of the day.
The period of daylight is important for many reasons. It affects the amount of sunlight that plants receive, which in turn affects the growth of plants. It also affects the amount of time that people have to spend outdoors, which can affect their health and well-being.