In What Sense Are the Quasars "Quasi- Stellar

Multiple Choice

In what sense are the quasars "quasi- stellar"?

A) Their energy production is hydrogen- helium fusion, like main- sequence stars.
B) Their spectra are like those of ordinary stars.
C) They are upscale versions of O stars, yet hundreds of times more massive.
D) In short time exposures, their images looked stellar.
E) Their luminosity comes from the millions of supergiants that compose them.