The Star P Cygni (In the Constellation Cygnus, the Swan)

Multiple Choice

The star P Cygni (in the constellation Cygnus, the Swan) is surrounded by an extensive low-density atmosphere. It has a bright, continuous spectrum with many narrow, dark absorption lines and a few bright emission lines. The bright emission lines are produced by

A) the low-density atmosphere of the star emitting light in all directions.
B) only the part of the low-density atmosphere that is between Earth and the surface of the star.
C) all parts of the star, the stellar surface, and the atmosphere, equally.
D) the hot, dense, opaque gas at or near the star's surface.