You Look into a Powerful Microscope and See a Single-Celled

You look into a powerful microscope and see a single-celled organism that is very small,has a cell wall,and no nucleus.You conclude that this organism belongs to the domain,

A) Eukarya.
B) Eukarya or Archaea.
C) Archaea.
D) Bacteria.
E) Arachea or Bacteria.