Which of the Following Is True of the Crime of Genocide

Which of the following is True of the crime of genocide according to international law?

A) The killing could be intentional or unintentional and still be considered genocide if enough people are killed.
B) Intentionality is required, but what constitutes evidence of intentionality is not clearly defined.
C) Any systematic killing, even if not targeted at a particular group can count as genocide if enough people are killed.
D) More than 1 million people have to die for a killing to be considered genocide.
E) The definition of genocide includes systematic killing based on race, but not religion.