Which of the Following Statements About Dark Matter Is FALSE

Which of the following statements about dark matter is FALSE:

A) it is observed to be a major part of the Milky Way
B) it is observed to be present in other groups of galaxies
C) astronomers have a pretty good idea what the dark matter is made of
D) we can detect its gravity, even though we can't see it
E) it may make up even more of the universe that the matter we can see