Robert Hooke coined the term cell when studying thin slices of cork. These ________ were the first ...

Robert Hooke coined the term cell when studying thin slices of cork. These ________ were the first cells observed because ________.
 
  A) dead plant cells; the thick cells walls did not require high resolution or magnification to view
  B) dead animal cells; they were immobile and did not need to be fixed before viewing
  C) compartments; they were actually the result of multiple cells that had merged and died to form large compartments that were easy to view
  D) immune cells; they produce antibodies that embed in the cell membrane to make it visible
  E) little rooms; they were 100 nm in diameter, much larger than most plant cells