The Temperature of the Sun Throughout Its Radius and Including

Multiple Choice

The temperature of the Sun throughout its radius and including its atmosphere

A) is almost constant from the center to the surface but falls abruptly above the visible surface.
B) decreases outward from the center but then increases again in the atmosphere.
C) decreases smoothly outward from the center, gradually merging at the "top" of the atmosphere into the cold of the interplanetary medium.
D) increases and decreases several times between the center and the surface, then decreases through the atmosphere.