Material from which of the following solar occurrences can reach Earth, causing radio blackouts?

a. Flare

b. Solar wind

c. Coronal mass ejection

d. Prominence

Material from (A.) Flare can reach the Earth causing radio blackouts. Solar flares are sudden, rapid and intense variation in brightness that is seen on the sun. It occurs when magnetic energy that has built up in the solar atmosphere, then suddenly released.