Irregularities in Brightness on the Sun's Photosphere Granules

Multiple Choice

Irregularities in brightness on the Sun's photosphere granules. are produced by___________ .

A) different elemental abundances being stirred within the photosphere, to produce variable brightness
B) large convective cells within the photosphere
C) local violent explosions within the photosphere equivalent to a hydrogen bomb explosion
D) pods of solid mass ejected to the photosphere by violent explosions within the Sun's interior, hence the name granule