Soon After Discovery, It Was Observed That Quasars Had a Starlike

Multiple Choice

Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they

A) have high radial velocities.
B) are very luminous.
C) are surrounded by quasar fuzz.
D) radiate huge amounts of energy.
E) fluctuate rapidly on time scales as short as a few hours.