The Big Surprise About the First Planet Discovered Around Another

The big surprise about the first planet discovered around another regular star was that it

A) was smaller than Mercury or Pluto in our own solar system
B) orbited so close to its star it took only 4 days to go around
C) had a mass greater than that of most stars
D) had a spectrum which indicated it was made of elements we never find on Earth
E) was inhabited by intelligent creatures which never had to take astronomy exams