In the Diagram Below,"A" Is _____ ;"B" Is _____

In the diagram below,"A" is _____ ;"B" is _____.

A) the most recent species identified on Earth;an ancestor of group "A"
B) the common ancestor of all life;the common ancestor of Bacteria and Archaea
C) the most recent species identified on Earth;the common ancestor of Archaea and Eukaryota
D) the common ancestor of life;the common ancestor of Archaea and Eukaryota