Professor Regina Aniger Is in an Archive,gathering Evidence on a Group

Professor Regina Aniger is in an archive,gathering evidence on a group of elite male politicians and governors in the 1770s for a book she is writing on how political conflict shaped the West.She discovers that all the existing evidence and documents about them ignore the roles of commoners.What does this missing information refer to?

A) Strangeness
B) Primary data
C) Synthesis
D) Missing cases
E) Silences