The Orion Nebula, M-42, Is a Hot, Thin Cloud of Glowing

Multiple Choice

The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is:

A) a continuum, strongest in the color red.
B) a few bright lines against a dark background.
C) a few dark lines in the continuum.
D) a continuum, but with both bright and dark lines mixed in.
E) not in the visible portion of the spectrum.