Which of the Following Is NOT a Possible Reason That

Multiple Choice

Which of the following is NOT a possible reason that Sirius was recorded as red between100 B.C. and 200 A.D., even though it is now seen as blue white?

A) Sirius A evolved from a red giant to a blue white star.
B) The companion white dwarf, Sirius B, was a bright red giant during those years.
C) There was a mistake made and propagated by scribes who copied the records.
D) There was a galactic dust cloud that passed between Sirius and us.