Quasars Were Originally Thought to Be Stars in the Milky

Quasars were originally thought to be stars in the Milky Way Galaxy. Which of these properties of quasars was LEAST unusual in comparison to normal stars?

A) They were dim in the visible part of the spectrum.
B) They were very energetic in the radio part of the spectrum.
C) Their spectra were dominated by emission lines rather than absorption lines.
D) Their spectra showed patterns that were, at first, unrecognizable.