How are granules and supergranules different?
a. The centers of granules are hotter than the edges, while supergranules show the opposite behavior.
b. Smaller convection cells below the photosphere produce the granules. Convection cells deeper under the photosphere cause the supergranules.
c. The size of granules is accidental. The largest of them are called supergranules.
d. Granules and supergranules are different in the matter they consist of.