A 16-year-old has pneumonia with a dry, hacking cough. The x-ray pattern shows a light, diffuse infiltrative pattern. The most likely organism producing these symptoms is

  •  A non-Gram-staining bacterium requiring sterols
  •   A bacitracin-sensitive, catalase-negative gram-positive coccus
  •   A bacillus showing granules when stained with methylene blue
  •  A gram-positive bacillus grown on a low oxidation-reduction medium
  •   A coagulase positive, gram-positive, catalase positive coccus in clusters