What causes sunspots?
A) Magnetic fields below the photosphere pull gas down, creating holes in the photosphere.
B) Differential rotation on the Sun creates vortices, or eddies, that are cooler and darker than the rest of the solar surface.
C) Solar flares cause the photosphere to expand and cool in the vicinity of the flare.
D) Magnetic fields breaking through the photosphere inhibit gas motion where the field is strong.
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