Which of the following is a natural phenomenon resulting from solar activity?

Auroras are indeed a natural phenomenon that results from solar activity. They occur when charged particles from the sun, particularly electrons and protons, collide with gases in Earth's atmosphere. This interaction excites the gas molecules, leading to the release of energy in the form of light, which creates the beautiful displays known as auroras, or the Northern and Southern Lights.

Solar activity, especially from phenomena like solar flares and coronal mass ejections, can enhance the density of these charged particles that reach Earth's magnetic field, leading to more vivid auroras. These displays are closely tied to solar cycles, showing how interconnected solar activity is with Earth's atmospheric phenomena.

Solar eclipses, while related to the positions of the sun, moon, and Earth, do not result from solar activity; instead, they occur due to the alignment of celestial bodies. Comet tails are created by the interaction of cometary material with solar radiation and solar wind, but they are not direct effects of solar activity in the way auroras are. Planetary rings are formed from dust and debris around planets and are not associated with solar activity at all.