Concerning Dark Energy, We Do Know

Concerning dark energy, we do know

A) that it is created when matter annihilates anti- matter.
B) that it was revealed with Type II supernovae distances in the late 1990s.
C) its density remains constant over time, so it is not important in the early universe.
D) that it makes up 90% of all the matter and energy in the whole universe.
E) combined with dark matter, it will ultimately produce a closed universe.