Pictures Sun Lunt Telescope Why Do Sunspots Appear Dark In Pictures Of The Sun?

Why do sunspots appear dark in pictures of the Sun? - pictures sun lunt telescope

a) are the holes on the surface of the sun, through which we see, the deeper, darker from the sun.
b) They are actually quite clear, but it seems dark, even in the context of the surrounding bright SO
c) You are too cold to emit visible light.
d) emit light with wavelengths that others can not see.
e) Very small black holes, absorbing all light that falls on them.