Irregularities in Brightness on the Sun's Photosphere (Granules)are Produced by ________

Irregularities in brightness on the Sun's photosphere (granules) are produced by ________.

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