During a total solar eclipse, which phenomena become visible as the sun is covered?

During a total solar eclipse, the moon completely covers the sun, allowing observers on Earth to see the sun's outer atmosphere, more commonly known as the corona. The corona is the sun's outer layer and is typically not visible due to the brightness of the photosphere.

Along with the corona, the chromosphere becomes visible as well. The chromosphere is the thin layer of the sun's atmosphere just above the photosphere, and during an eclipse, its reddish hue can be observed as the sun's disk is obscured. Additionally, solar prominences, which are large, bright features extending outward from the corona, can also be seen during this time as they are highlighted against the darker sky.

Therefore, during a total solar eclipse, the phenomena that become visible include the chromosphere, the corona, and solar prominences, making the choice that includes all three correct.