Biology Forums - Study Force

A solar plage is
A)   a cooler region of the photosphere surrounding the very cold central region of a sunspot.
B)   a brightening of a portion of the Sun in light from hydrogen and other atomic species, appearing just before a sunspot and then surrounding it.
C)   a “hole” in the hot corona through which solar wind escapes into interplanetary space.
D)   a gigantic loop of gas, lifted by magnetic fields above the solar surface, appearing dark against the photosphere and bright against dark space.

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On behalf of my study group and I, thank you

thanks!