Whittaker's Classification Included Kingdom Monera, Which Included All Prokaryotes

Whittaker's classification included Kingdom Monera, which included all prokaryotes. Why is this classification obsolete?

A) Based on fossil evidence, this group has been divided into three newly named kingdoms.
B) This kingdom now includes more organisms, so the name has been changed.
C) The prokaryotes, which were included in this kingdom, are now included in Protista.
D) Based on molecular data, Monera has been divided into the two distinct domains, Archaea and Bacteria.