Which Element Is LEAST Characteristic of Greek Tragedies

Which element is LEAST characteristic of Greek tragedies?

A) They dealt with universal themes that still seem current today.
B) Oresteia is the only complete trilogy that still exists.
C) They developed before Greek comedy as a dramatic form. .
D) Although they were based on suffering and disaster, they often ended on a positive note. .
E) One popular theme was the nature of good and evil.