The Major Surprise About Cygnus A, One of the First

Multiple Choice

The major surprise about Cygnus A, one of the first three sources of strong radio emission detected by Grote Reber in the late 1930s, when examined with large optical telescopes, was that it

A) had no corresponding optical counterpart at all.
B) was at the center of the Milky Way Galaxy.
C) was a very distant object that was relatively faint at optical wavelengths yet extremely luminous at radio wavelengths.
D) was a very bright supernova remnant.