Which of the Following Statements About Our Modern Ideas of How

Multiple Choice

Which of the following statements about our modern ideas of how spiral galaxies form and develop is TRUE?

A) the central bulges of spiral galaxies formed first and their disks formed later
B) star formation in the spiral galaxies is much higher today than it was 8 billion years ago
C) spiral galaxies formed pretty quickly after the Big Bang and already looked then the way they look today
D) spiral galaxies have evolved until today they are all "red and dead", containing just old stars and showing almost no current star formation
E) spiral galaxies cannot have a central super-massive black hole, so astronomers don't understand just how they formed