The correct answer is C. Autumn.
Step-by-step explanation
During the orbit of the Earth on its inclined axis around the Sun there are four main positions that means four different periods throughout the year: they are the solstices and the equinoxes. These periods are also known as the spring, summer, autumn, and winter seasons. Each season of the year has its characteristics concerning temperature, rainfall, and sunlight, among other characteristics. The image shows the sun to the left of the earth, so it can be said that it is in the position of the equinox on September 23. In this position, the northern hemisphere is in autumn and the southern in spring. So the correct answer is C. Autumn.