The first organisms (Multiple Choice)

The first organisms
 
  a. had to be aerobic.
  b. were pathogenic.
  c. had to be anaerobic.
  d. were heterotrophs.
  e. were multi-celled

Question 2

Which of the following statements most likely
  apply to the earliest cells?
 
  a. They were prokaryotic cells.
  b. It is likely that earliest cells did not have a
  nucleus but had membrane-bound
  organelles.
  c. The earliest cells may have used oxygen
  gas in order to thrive successfully.
  d. Energy from the sun may have been used
  by the earliest cells.
  e. All of these statements most likely apply