Read the paragraph, then choose the word that best completes the sentence.

Question

At extreme northern and southern latitudes, green and red glows are occasionally glimpsed in the night sky.
These fantastic, natural light shows are called auroras. Auroras are caused by electrically charged particles ejected from the sun. These particles sail through space until they strike Earth's natural magnetic field. There, they are compressed and channeled to the poles, where the magnetic field is strongest. Chemical interactions with nitrogen and oxygen in the atmosphere produce the characteristic glow.
Auroras are colorful.
B
C
D
phenomena
tapestries
murals
rainbows

Answer 1

The word that best completes the sentence is phenomena.

So the sentence would read: "Auroras are colorful phenomena."

This is because "phenomena" refers to observable events, which fits well with the context of auroras being natural occurrences in the night sky.